单项选择题

Driving and talking on the phone at the same time could be（）research says.

A．difficult
B．dangerous
C．illegal
D．fun

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单项选择题
The boy sold goods from door to door because （）

A．he wanted to help support his family
B．he needed money for school
C．he had to pay back a student loan
D．he did not have enough pocket money
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