Keep an optimistic and positive attitude

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问题选择题

Keep an optimistic and positive attitude — Don't put yourself to any _____

A．mood

B．impression

C．effect

D．bother

答案

答案：D

句意: 保持乐观积极的心态, 不要自寻烦恼。bother用作名词，意思为“烦扰；麻烦”。

选择题

We do have the most supportive parents and teachers, ________will make a difference to our study, unless all of us make every effort .

A．none of them

B．all of them

C．none of whom

D．all of whom

单项选择题

光纤直放站近端机内光电模块的作用是（）。

A.进行光电信号转换。

B.将基站里耦合出来的光信号转化为电信号用于传输。

C.将传输过来的光信号转化为电信号。