单项选择题


Questions 23 to 25 are based on the conversation you have just heard.

A．Because they don’t have support networks.
B．Because they cannot cope with the difficulties in their lives.
C．Because the woman is famous for helping others.
D．Because people from their nationality refuse to help them.
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单项选择题
The study published in the journal Nature indicates that ______.
A．the Clean Air Act has not produced the desired results
B．lead deposits in arctic snow are on the increase
C．lead will stay in soil and snow longer than expected
D．the US is the major source of lead pollution in arctic snow
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