免费 OC 练习测验
免费、无需注册、无需付款。试做一组符合当前 Opportunity Class（OC）格式的练习题——Reading（阅读）、Mathematical Reasoning（数学推理）和 Thinking Skills（思维技能）——每题都附有详细解析。每一道题都是由教育工作者编写的示例题，而非 NSW 真实历年真题（真题从不对外公布）。
- 免费
- 无需注册、无需付款
- 18 道题
- 覆盖 OC 三个部分
- Year 4
- 为 Year 5 入读 OC 做准备
由 Hootbrook 教育团队撰写与审核 · 最后审核：30 August 2026
OC 考试考什么？
Opportunity Class（OC）分班考试在 Year 4 参加，用于争取 Year 5 进入 Opportunity Class 的名额。它包含三个部分——Reading（阅读）、Mathematical Reasoning（数学推理）和 Thinking Skills（思维技能）——在电脑上作答，没有写作任务。下面的练习题涵盖了全部三个部分。
本页面用于做练习。如需了解日期、考试格式和分班机制的完整指南，请查看我们的完整 OC 考试指南。
试做 18 道 OC 练习题
选择一个答案，即可看到它是否正确以及是如何解出的——无需注册。这些是符合当前 OC 格式、涵盖全部三个部分的示例题，并非 NSW 真实历年真题。每次做几道就好；理解每一题的答案，比匆匆做完更重要。
下面的样题以英文呈现——OC 考试本身也是用英文进行的。
“The old lighthouse had not shone for thirty years, yet every evening Mrs Patel climbed its spiral stairs. She carried no lamp and lit no flame. Instead she sat by the great dark window with her notebook, counting the ships that slipped past in the dusk and writing down their names.”Why did Mrs Patel climb the lighthouse each evening?
Choose an answer to see how it’s worked out.That’s it.
Close — answer from what the passage actually says.
The passage tells us she carried no lamp and lit no flame, which rules out lighting it. It then says she counted the ships and wrote down their names — she was keeping a record. Inference means using what the text states, not what a lighthouse is usually for.
“She sat by the great dark window, counting the ships that slipped past in the dusk and writing down their names.”In this passage, the word “slipped” most nearly means:
Choose an answer to see how it’s worked out.That’s it.
Close — let the sentence decide the meaning.
“Slipped” has several meanings, but here the ships are moving past in the dusk, so it means moved quietly and smoothly. Vocabulary-in-context questions reward the meaning the sentence supports, not the most common one.
“Honeybees cannot see the colour red. To our eyes a field of red poppies looks bright, but to a bee the same flowers appear dull and grey. This is one reason bees visit blue and purple flowers far more often. Gardeners who want to attract bees are often advised to plant lavender rather than red roses.”Which sentence best states the main idea of the passage?
Choose an answer to see how it’s worked out.That’s it.
Close — the main idea is what every sentence supports.
Every sentence points to one idea: bees see colours differently, and that shapes which flowers they choose. Options A and D are single details, and B is an overstatement — none of them is the whole point of the passage.
“Honeybees cannot see the colour red… bees visit blue and purple flowers far more often. Gardeners who want to attract bees are often advised to plant lavender rather than red roses.”Based on the passage, a gardener who plants only red roses will probably find that:
Choose an answer to see how it’s worked out.That’s it.
Close — follow what the passage tells us about red.
The passage says bees rarely visit red flowers and advises lavender over red roses, so red roses would draw fewer bees than lavender. It never says roses can’t grow, and it states bees see red as dull, not bright.
“The scientist’s explanation was so clear that even the youngest student could grasp it.”In this sentence, the word “grasp” most nearly means:
Choose an answer to see how it’s worked out.That’s it.
Close — think about what is being grasped.
“Grasp” can mean to hold something in your hand, but here a student is grasping an explanation, so it means understand. The clue is the context — a clear explanation a student could follow.
“By the time Sara reached the bus stop, the road was empty and the timetable on the pole was wet with rain. She sighed, pulled her hood up, and began the long walk to school.”What can we most reasonably infer from the passage?
Choose an answer to see how it’s worked out.That’s it.
Close — read the clues the writer leaves.
The empty road, Sara’s sigh, and her setting off on the “long walk to school” instead of waiting all point to the bus having already gone. Nothing says she planned to walk, and the wet timetable shows rain, not sun. Inference means reading the clues, not just the stated words.
A baker makes 6 trays of muffins. Each tray holds 8 muffins. She sells 34 muffins in the morning. How many muffins are left?
Choose an answer to see how it’s worked out.That’s it.
Close — find the total before you subtract.
First find how many muffins there are: 6 trays × 8 = 48. Then take away what was sold: 48 − 34 = 14 left. The trap answer 82 comes from adding 48 and 34; do the multiplication first, then the subtraction.
Leo buys a book for $12 and a pen for $3.50. He pays with a $20 note. How much change should he receive?
Choose an answer to see how it’s worked out.That’s it.
Close — add both items before taking the change.
Add the two prices first: $12 + $3.50 = $15.50. Then subtract from the $20 note: $20 − $15.50 = $4.50 change. Adding both items before you subtract avoids the common slip of paying for only one.
A pizza is cut into 8 equal slices. Maya eats 3 slices and her brother eats 2 slices. What fraction of the pizza is left?
Choose an answer to see how it’s worked out.That’s it.
Close — the question asks what is left, not what was eaten.
Together they eat 3 + 2 = 5 slices out of 8, so 5/8 is gone. That leaves 8 − 5 = 3 slices, which is 3/8 of the pizza. The trap answer 5/8 is the part eaten, not the part left.
A film starts at 2:45 pm and runs for 1 hour and 40 minutes. What time does it finish?
Choose an answer to see how it’s worked out.That’s it.
Close — add the hour and the minutes in two steps.
Add the hour first: 2:45 → 3:45. Then add the 40 minutes: 15 minutes reaches 4:00, and 25 more makes 4:25 pm. Splitting the time into the hour and the minutes keeps it simple.
In a car park there are only motorbikes and cars. Altogether there are 7 vehicles and 22 wheels. A motorbike has 2 wheels and a car has 4 wheels. How many cars are there?
Choose an answer to see how it’s worked out.That’s it.
Close — start by imagining they were all the same.
If all 7 vehicles were motorbikes, that would be 7 × 2 = 14 wheels — but there are 22, which is 8 extra. Each car has 2 wheels more than a motorbike, so 8 ÷ 2 = 4 cars. Check: 4 cars and 3 motorbikes give 16 + 6 = 22 wheels.
Three identical books weigh 900 grams altogether. How much would 5 of the same books weigh?
Choose an answer to see how it’s worked out.That’s it.
Close — find one book first, then scale up.
Find the weight of one book: 900 ÷ 3 = 300 grams each. Then 5 books weigh 5 × 300 = 1500 grams. Working out the single value before multiplying is the key step.
Four runners finished a race: Kim, Lena, Mo and Sam. Kim finished before Lena. Sam finished after Lena. Mo finished before Kim. In what order did they finish, first to last?
Choose an answer to see how it’s worked out.That’s it.
Close — chain the clues into one line before choosing.
“Mo before Kim” and “Kim before Lena” give Mo, Kim, Lena in that order. “Sam after Lena” puts Sam last. Joined up, the finish order is Mo, Kim, Lena, Sam. Lining every clue up before you answer is what these puzzles reward.
In Mr Roy’s class, every child who plays chess also plays the violin. Dev does not play the violin. Which statement must be true?
Choose an answer to see how it’s worked out.That’s it.
Close — follow the rule, don’t add to it.
If every chess player also plays the violin, then anyone who does not play the violin cannot be a chess player. Dev does not play the violin, so Dev cannot play chess. The other options add facts the statements never give.
Anya, Bo and Cara each have a different pet: a cat, a dog or a fish. Anya is allergic to fur, so she has neither the cat nor the dog. Bo takes his pet for walks. Which pet does Cara have?
Choose an answer to see how it’s worked out.That’s it.
Close — settle the pets you can be sure of first.
Anya can’t have fur, so she has the fish. Bo takes his pet for walks, so Bo has the dog (the fish is taken, and you don’t walk a cat). That leaves the cat for Cara. Fixing the certain pets first leaves the last one by elimination.
A poster reads: “Drink FizzyBerry — the most popular fizzy drink at Sunfield School!” The poster wants you to believe FizzyBerry is a good choice. Which assumption does the poster rely on?
Choose an answer to see how it’s worked out.That’s it.
Close — find the missing link in the argument.
The poster jumps from “most popular” to “good choice”. That only works if being popular actually makes something a good choice — the unstated assumption. The other options may be true, but the argument doesn’t depend on them.
Ravi says his new running shoes made him faster, because he ran his best-ever time the first day he wore them. Which statement, if true, would most weaken Ravi’s claim?
Choose an answer to see how it’s worked out.That’s it.
Close — look for another cause of the fast time.
Ravi assumes the shoes caused his fast time. If a tailwind pushed him the whole way, that — not the shoes — could explain the best time. Pointing to another likely cause is the strongest way to weaken a “this caused that” claim.
Look at the number pattern: 1, 4, 9, 16, 25, … What is the next number?
Choose an answer to see how it’s worked out.That’s it.
Close — look at how the gaps grow.
Each number is a square: 1×1, 2×2, 3×3, 4×4, 5×5, so the next is 6×6 = 36. You can also see the gaps grow by 2 each time (+3, +5, +7, +9, then +11), and 25 + 11 = 36.
如何让练习发挥最大作用
平和、诚实的方法，每次都胜过临时突击。
少量而频繁。 短时、规律的练习——每天专注十分钟——胜过临时抱佛脚的一个周末。稳扎稳打胜过手忙脚乱。
重理解，不靠套路。 每做完一题，让孩子说说为什么这个答案是对的。只要他能讲清楚原因，这项能力就能迁移到从没见过的题目上。
把题目读两遍。 大多数失误都来自漏看一个词——“不”“只”“剩下”“每”。教孩子在选择前仔细读题。
交叉练习各部分。 在 Reading（阅读）、Mathematical Reasoning（数学推理）和 Thinking Skills（思维技能）之间穿插练习，让练习更贴近真实考试，而不是一次只练一种能力。
边做边讲。 桌游、谜题，以及“你怎么知道的？”这样的对话，能培养考试所看重的同一种推理能力，无需任何练习卷。
从真实水平出发。 免费测评能显示孩子在每个部分的真实水平，让时间用在真正的薄弱环节上——而不是他们已经会的内容。
一点诚实的说明
市面上没有真实的 OC 历年真题出售——NSW Department of Education 不会公布它们，因此请警惕任何声称有真题的人。这里的每一道题都由教育工作者按当前 OC 格式编写。像这样的练习能让孩子熟悉题型、增强信心；它无法保证录取，任何课程都做不到。Hootbrook 与 NSW Department of Education 无隶属或背书关系。
免费 OC 练习测验——常见问题
这个 OC 练习测验真的免费吗？
是的——完全免费，无需注册、无需付款。您现在就可以试做本页面上的每一道题。免费测评也是免费的；如果日后想要完整的引导式课程，付费方案是可选的。
这些是真实的 OC 历年真题吗？
不是。NSW Department of Education 不公布 OC 考试真题，因此任何地方都没有真正的历年真题。这里的每一道题都是由教育工作者按当前 OC 格式编写、并在使用前经过检查的示例题。
OC 考试是为哪个年级准备的？
OC 分班考试在 Year 4 参加，用于争取 Year 5 进入 Opportunity Class。本页面的练习正是针对 Year 4 这一水平设计的。
本页面上有多少道练习题？
十八道——六道 Reading（阅读）、六道 Mathematical Reasoning（数学推理）和六道 Thinking Skills（思维技能）——每题都有详细解析。免费测评和完整课程包含更多题目。
练习真的有用吗？
练习能让孩子熟悉题型，并因认得这些题型而更有信心，从而在考试当天正常发挥。它无法保证录取——任何课程都不能——而且 OC 考试旨在识别能力，而非奖励应试培训。诚实的目标，是一个平和、准备充分的孩子。
孩子该如何使用这些题目？
每次做几道，不慌不忙。仔细读题、选出答案，然后一起阅读解析——目的是理解为什么答案是对的，而不是把它背下来。少量而频繁，远比一次长时间的练习有效。
今天就看看孩子的水平
从免费测评开始。它能找出孩子在 Reading（阅读）、Mathematical Reasoning（数学推理）和 Thinking Skills（思维技能）各部分的真实水平——让练习从真实情况出发，而不是靠猜。