单项选择题

A．He lives in that street.
B．Let’s go.
C．Yes, I did.
D．I’m so sorry to hear that.
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单项选择题
Jefferson obtained the first-hand information needed in his research work through making on-the-spot observation.
A．杰弗逊通过现场勘查，获得了研究工作所需要的第一手资料。
B．杰弗逊借助于实地观察，获得了科研工作所需要的第一手资料。
C．杰弗逊通过对某一点的观察得到需要的第一手资料。
D．杰弗逊用实践观察获得了科研工作的第一手资料。
单项选择题
David is different from other young people of his age because ______.
A．he does not go out much
B．he is unemployed
C．he earns an extremely high salary
D．he lives at home with his parents
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