西周“封建亲戚，以藩屏周”，这里的“封建”是指 [ ]
A．封邦建国
B．建立周王统帅的军队
C．制定周礼
D．建立庞大的都城
答案：A
下列常用词语中书写完全正确的一项是
A．合衷共济哄堂大笑欢呼雀跃
B．惹是生非仁致义尽色厉内荏
C．欢欣鼓舞故弄玄虛行迹可疑
D．上吐下泻有条不紊胁从不问
In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
Microwave communication uses (1) -frequency radio waves that travel in straightline sthrough the air. Because the waves cannot (2) with the curvature of the earth, they can be (3) only over short distance. Thus, microwave is a good (4) 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 (5) . These can be installed on towers, highbuildings, and mountain tops.
4（）
A．material
B．equipment
C．medium
D．channel
