单项选择题

What is the concern of ordinary people about the greenhouse effect（）

A．Whether global warming will speed up in the future.
B．Whether it will lead to widespread food shortage.
C．Whether it can be detected and checked.
D．Whether it will affect their own lives.

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单项选择题
What happened in London a few months ago（）

A．The heart of London was flooded.
B．An emergency exercise was conducted.
C．100 people in the suburbs were drowned.
D．One of the bridges between North and South London collapsed.
单项选择题
What was the main harmful effect of the pest killer DDT on bald eagles（）

A．It limited their supply of food.
B．It killed many baby bald eagles.
C．It destroyed many of their nests.
D．It made their eggshells too fragile.
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