In the following essay, each blank has four choices. Choose the best answer and write-down on the answer sheet.

Microwave communication uses high-frequency (29) waves that travel in straightlines through the air. Because the waves cannot (30) with the curvature of the earth, they can be (31) only over short distance. Thus, microwave is a good (32) for sending data between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of "dishes" or (33) . These can be installed on towers, highbuildings, and mountain tops.

32（）

A.material 

B.equipment 

C.medium 

D.channel

下列不属于直接影响外汇市场走势的风险因素是（）。

A.经济因素

B.政治因素

C.突发事件

D.气候条件