The main idea of the whole story is that ______.
A. butterflies like to be sprayed
B. birds are better than sprays to get rid of insects
C. the people in Illinois like to make bird houses
D. baby birds like to eat insects
查看答案
A．offeredB．judgedC．checkedD．wondered
A. offered
B. judged
C. checked
D. wondered
酸雨是指pH值等于6.0的降水。（）
A. 正确
B. 错误
生物个体、种群和群落都是经典生态学的研究对象。（）
A. 正确
B. 错误
What kind of birds came to the bird houses？
A. Soon robins came to the bird houses.
B. Soon bluebirds built nests in the bird houses.
C. Soon purple martins built nests in the bird houses.
D. Soon baby birds built nests in the bird houses.
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