Question

100℃ is the temperature ______ which water will boil

1. A.
   for
2. B.
   at
3. C.
   on
4. D.
   of

Answer 1

B
此处是介词前置的定语从句，temperature是先行词，根据介词短语at the temperature可知用at which，which代替temperature。句意：100度是水沸腾的温度。
【考点定位】考查介词的用法。