题目内容

What was her major in Pennsylvania College for Women?

A. )English
B. ) science
C. )biology

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What happened to many songbirds and harmless insects after the application of DDT?

A. )They died.
B. )They ate the mosquitoes in the area.
C. )They increased in great number.

When did pesticides become widely used in the United States?

A. )After WWI.
B. ) After WWII.
C. )Before WWII.

What decision was made by the US government in 1969?

A. )The use of DDT must stop right away.
B. ) The use of DDT must stop before 1971.
C. ) The use of DDT should be encouraged.

In silence the others watched him as if under a ____.

A. spell
B. spelt
C. spelled
D. spelling

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