—What a hot day it is! —So it is. I think an umbrella can help you the heat.A. keep on B.

问题补充：

—What a hot day it is! —So it is. I think an umbrella can help you the heat.

A. keep on

B. keep out

C. keep in

D. keep up

答案：

A. keep on

(答案→)B. keep out

C. keep in

D. keep up

解析：句意：多么炎热的一天，确实如此，我认为一把伞能帮助你防热。keep out,保持……在外边。根据句意，故选B。