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下图为 “大气受热过程示意图”，回答1—3题。

1、对流层大气的热量，绝大部分直接来自图中辐射的是[ ]

A、①

B、③

C、⑤

D、⑦

2、冬季，农民蔬菜生产用塑料大棚来制造温室环境，图中相当于塑料大棚作用的是[ ]

A、①

B、②

C、③

D、⑤

3、如果地球上没有大气，则图中不存在的是[ ]

A、①

B、④

C、⑤

D、⑥

答案

1、C

2、C

3、B

问答题

苔藓样变
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填空题

Last year I caught the baby cuckoo and put 56. ______
it in a cage outside. Later its mother flew from the cage 57. ______
with food in her mouth. I was happy to see this, because of 58. ______
the mother bird knew much better than I did to feed her 59. ______
baby. But the following morning I found the baby bird60. ______
died. I told the story of my bird to my biology teacher 61. ______
and he explained that what had happened. A mother 62. ______
cuckoo, finds her baby in a cage, will bring it poison63. ______
food. She believes it is good for her baby to die than to 64. ______
live in a cage. I still feel sorry for what I do to the bird.65. ______
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