已有定义：char a[]="xyz",b[]={''x'',''y'',''z''};，以下叙述中正确的是______。

A．数组 a 和 b 的长度相同

B．a 数组长度小于 b 数组长度

C．a 数组长度大于 b 数组长度

D．上述说法都不对

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

Microwave communication uses high-frequency (26) waves that travel in straightlines through the air. Because the waves cannot (27) with the curvature of the earth, they can be (28) only over short distance. Thus, microwave is a good (29) for sendingdata between buildings in a city or on a large college campus. For longer distances, the wavesmust be relayed by means of "dishes" or (30) . These can be installed on towers, highbuildings, and mountain tops.

（27）是（）

A.reflex

B.distort

C.bend

D.absorb