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问题 选择题

将绿色水草放在金鱼缸里的作用是（　　）

A．增加养料

B．增加氧气含量

C．保持水清洁

D．美化鱼的生活环境

答案

绿色水草放在金鱼缸里可以进行光合作用，由分析可知光合作用能够释放氧气，因此能增加鱼缸中氧气的含量，为金鱼提供充足的氧气以促进其长时间的存活．故B是正确的．

故选B

选择题

含羞草对刺激作出反应与下列哪一生理现象相同       (     )

A．植物的呼吸

B．人手被针刺后缩回

C．子女与父母相同

D．植物的光合作用
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单项选择题

During our two months on the road, Bennett and I had a really (1) experience with a good, honest (2) and some helpful mechanics.

We were driving east on Highway 10 when our "chick engine" light came on. We limped of a(n) (3) into Las Cruces. We had a real car (4) Bennett nursed the ear into a local garage. By this time the car was missing so (5) it was shaking all over. This was the (6) time to arrive at a garage—late Friday afternoon. Service adviser Scott was busy (7) paper work and customers as we (8) our problems. (9) he was already "ten cars behind", he told us to pull the car into the garage.

Lincoln, who we later (10) was one of the two motor technicians, took (11) of our car repairing. He and Scott and some other mechanics stayed several hours after closing, (12) the car.

Early the next morning (the shop was officially closed on Saturdays), Lincoln finally located the (13) and fixed it easily within only (14)

Later Scott (15) out to us that it was our attitude that helped. "You didn’t come into the place demanding this or that. You showed an (16) of our problems on a busy Friday afternoon. Customer’s attitude means a lot. " He was right in some way, customers should show (17) and understanding to people who (18) them. (19) people were extremely busy, they found way to at least try and help when they are met with politeness.

The pleasant experience I had shows that (20) for other people can always help.

16（）

A.understanding 

B.ignorance 

C.appreciation 

D.awareness
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