Unit 2 Teams 一、单项选择（共15小题；共45分） 从下面各题所给选项中，选择最佳选项。 1. —What do you want to be when you grow up? —I want to be an _____ so that I can explore space. A.actor B.engineer C.astronaut 根据语境，选出最佳选项。 2. A (An) _____ is something that makes you understand there is a possible danger. A.meaning B.appearance C.warning 从下面各题所给选项中，选择最佳选项。 3. A/An _____ means a scientific test which is done to learn something. A.experiment B.hobby C.quiz 4. I want to be a(n) _____ and fly to space when I grow up. A.actor B.astronaut C.pilot 5. He gave a speech named How to Eat Healthily in a high voice, so we all could hear him. A.talk B.book C.film D.joke 6. David likes taking photos, so his father bought him a _____ last week. A.camera B.dictionary C.bicycle 7. His father cut down a pair of his trousers and tied them with string round his _____ to hold them up. A.tummy B.foot C.neck 8. A/An _____ is a test made in order to learn something. A.joke B.experiment C.hobby 9. A _____ is two people who are married and live together. A.couple B.family C.husband 10. A(An) _____ is one of the many small planets that move around the Sun, especially between Mars and Jupiter. A.star B.asteroid C.galaxy 11. We usually do lots of interesting _____ in our physics class. A.rules B.exhibitions C.experiments D.communications 12. —Why didn't you do your homework? —It was too _____ in the room. I couldn't see anything. A.dark B.slow C.fast D.exciting 13. Tom has gone on business, and he will _____ to the company in one week. A.collect B.leave C.reach D.return 14. When an earthquake happens, I think the most important safety _____ is to keep calm. A.rule B.doubt C.condition D.problem 从下面各题所给选项中，选择最佳选项。 15. Tom is in good health, because he often exercises and eats a lot of healthy _____. A.food B.water C.pear D.carrot 二、完形填空（共1小题；共30分） 阅读下面的短文，掌握其大意，然后从短文后各题所给的选项中，选择最佳选项。 Number sense is not the ability to count. It is the ability to recognize a change in number. Human beings are born with this ability. Surprisingly, _____16_____ show that many animals are, too. For example, many birds have good number sense. If a nest (巢) has four eggs and you remove one, the bird will not notice. However, if you remove two, the bird generally leaves. This means that the bird _____17_____ the difference between two and three. Another interesting test showed a bird's _____18_____ number sense. A man was trying to take a photo of a crow that had a nest in a tower, but the crow always left when she saw him coming. The bird did not _____19_____ until the man left the tower. The man had an idea. He took another man with him to the tower. One man left and the other stayed, but they weren't successful in fooling the bird. The crow stayed away until the second man left, too. The test was _____20_____ with three men and then with four men. It was not until five men went into the tower and ... ...
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