单项选择题

Disease -carrying insects become important where human being are crowded together（）

A．在人们聚集在一起的地方，带病昆虫的问题就变得很严重。
B．在人们居住的地方，带病昆虫在控制人口过剩问题方面起着重要作用。
C．在人们密集地区，带病昆虫成为一个严重的问题。
D．带病昆虫是人们密集地区必不可少的。

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热门试题

单项选择题

It is in view of our standing business relationship that we make you such a counter - offer.（）

A．由于我们双方标准的贸易关系，我方才向你方作出如此报盘。
B．考虑到我们双方停止不前的商贸关系，我方才向你方给出如此报盘。
C．正是由于我们双方固定的商贸关系，我方才向你方给出如此还盘。
D．正是鉴于我们双方长期的贸易关系，我方才向你方作出如此还盘。

单项选择题

What were those American women tested for during the whole month（）

A．For the selection of the responsible persons.
B．For the condition of different group of the women.
C．To see if they were suitable for the space work.
D．To see how they would react to conditions like those aboard the space shuttle.