问题 单项选择题

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

答案

参考答案:C

解答题
问答题

       第一面五星红旗在 * * 广场冉冉升起,标志着在中 * * 党领导下,新民主主义革命取得胜利,揭开了中国现代历史的新篇章。根据所学历史知识回答下列问题:

(1)“第一面五星红旗在 * * 广场冉冉升起”是什么时间?这是什么历史事件中的一个场面?

                                                                                                                                                            

(2)新中国成立是中国有史以来最伟大的事件,为什么?

                                                                                                                                                            

                                                                                                                                                            

(3)新中国的成立是20世纪世界历史进程中最伟大的事件之一。请写出与此同类性质且在历史进程中具有深刻影响的事件。    

                                                                                                                                                             

(4)你从“在中 * * 党领导下,新民主主义革命取得胜利”得到什么启示?