Question

Swimming is good for our health. but ________ the same time the danger is everyw

Swimming is good for our health. but ________ the same time the danger is everywhere.
A. in
B. at
C. on
D. for

Answer 1

答案B
思路分析：该题考查根据句意选用适当的介词构成介词短语．at和in都能和the same time相搭配，但所表达的意思不同：at the same tine同时，然而，可是；In the same time用同样的时间．at表示的时间是一个点，in表示的是一段时间．前者讲在同一个时间点做了什么，后者讲在同一段时间做了什么．另外，at the same time可以表示转折意义，而in the same time则不能这样用．后一个分句中介词短语的用法属于前者．试比较：
The two 100-metre runners reached the finish line at the same time.
这两个百米运动员同时跑到终点站．
I'll forgive you, at the same time you must never do it again.
我可以原谅你，可你以后绝对不能这样干了．
They finished the task in the same time.
他们用同样时间完成了任务．"