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问题 选择题

6月5日是世界环境保护日．下列活动对环境造成污染的是（　　）

A．①②

B．①③

C．①④

D．②④

答案

①喷洒农药其残留会对空气土壤等造成危害，对环境有污染．

②光合作用吸收二氧化碳和水合成有机物释放能量，不但不会对环境造成污染，而且对稳定化境状况有一定帮助．

③工业废气是对大气造成污染的主要污染物．

④人、动植物的呼吸是自然界中碳循环的主要方式，不会造成环境污染．

故选B

单项选择题

One day while a girl was walking in the woods she found two starving songbirds. She took them home and put them in a small (31) . She cared for them and felt great love for them.

Once the (32) and per of the two birds flew from the cage. Therefore, (33) he flew close, she grasped him (34) . She felt glad, but suddenly she felt the bird go limp. She opened her hand and (35) in horror at the dead bird.

She noticed the other bird moving back and forth on the edge of the cage. She could feel his great need for (36) . She lifted him from the cage and (37) him softly into the air. The bird circled once, twice, three times.

The girl watched delightedly at the bird’ s enjoyment. Her heart was no longer (38) with her loss. Suddenly the bird flew closer and (39) softly on her shoulder. It sang the sweetest melody that she had ever heard.

The fastest way to (40) love is to hold on it too tightly, while the best way to keep love is to give it WINGS!

（35）（）

A.cage

B.box

C.tank

D.room
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单项选择题

夜间等会列车时，应将机车头灯灯光（）或熄灭。

A.关闭

B.调整

C.减弱

D.遮挡
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