问题 问答题 简答题

水平界面情况下,一次反射波和多次反射波叠加效应是怎样的?

答案

参考答案:

一次反射波效应增强,多次反射波叠加效应减弱。

完形填空

Directions: Complete the following passage by filling in each blank with one word that best fits

the context.

On the first day of classes at a Los Angeles high school, several American boys came up to a Chinese boy and said: “Hi, what’s up?”   48   hearing their greeting, the boy,   49    had just moved to the US with his parents, raised his head and looked at the sky.

This is a story told by David Chen,  50  31-year-old actor in Taiwan who recently launched a Sina mini-blog, on which he teaches easy English expressions.

  51  me, the mini-blog is like a mirror.When I read the comments, I see myself more clearly.”

Chen made a breakthrough last year    52  he had a double-eyelid surgery.“I like making changes and I think it’s necessary,” he said.“I know many fans like my pretty boy image.But now I’m growing up, I want to look rougher and  53 mature.”

“When you have a new haircut, you do not need to explain it.__54___ is just like changing your mood to do so–if you feel happy, that’s great,” said Chen.“Young people should realize    

that sometimes you can just do what you want to do.You will eventually get support from others if you dare to be   55  .”

PART THREE READING COMPREHENSION

Directions: read the following three passages.Each passages is followed by several questions or unfinished statements.For each of them there are four choices marked with A, B, C and D.choose the one that fits best according to the information given in the passage.

单项选择题