根据下面的文字资料回答 71~75 题In the following essay,each blank has fourchoices.Choose th
Microwave communication uses(1 )frequency radio waves that travel instraighdine sthroughthe air.Because the waves cannot(2 )with the curvature of the earth,they can be (3 )onlyover short distance.Thus,microwave is a good(4 )for sending data between bulldingsin a city or on a large college campus.For longer distances,the waves must berelayed by means of“dishes”or(5 ).These can be installed on towers,highbuildings,and mountain tops.
第71题:文中(1 )处正确的答案是()。
A.high
B.10w
C.1ong
D.short