问题 单项选择题

蹦极运动员从高处跳下,弹性绳被拉展前做自由落体运动,被拉展后在弹性绳的缓冲作用下,下落到一定高度后速度减为零。下列说法中正确的是()

A.弹性绳拉展前运动员处于失重状态,弹性绳拉展后运动员处于超重状态

B.弹性绳拉展后运动员先处于失重状态,后处于超重状态

C.弹性绳拉展后运动员先处于超重状态,后处于失重状态

D.运动员一直处于失重状态

答案

参考答案:B

解析:在弹性绳被拉展后,开始是速度增大,做加速运动,在这个阶段加速度向下,处于失重状态,在速度达到最大后,开始做减速运动,一直到速度为零,然后弹性绳收缩,人向上运动,在这个阶段加速度向上,人处于超重状态。

阅读理解

阅读短文,根据要求完成下列各小题。

     The relationship between student and teacher is less formal (正式的) in the U.S. than in many other

countries, especially at the college level. (1)当老师走进教室时,学生不必起立. Students are generally

encouraged to ask questions during class, to go to the teacher's office for help after class, and to phone

if they can't go to school and need help with their lessons. (2)Most teachers allow students to enter class

late or leave early, if necessary.

     (3)However, students are still asked to be____________ to their teacher and classmates and to be

____________ during a test. When the teacher or a student is speaking to the class, it's rude to talk to

another classmate, even in a low voice. When a test is being given, talking to a classmate is not only rude

but also wrong. In the eyes of most American teachers, students who are talking to each other during a

test are cheating (作弊).

A. 英汉互译。

1. 将(1)句译成英文。

                                                                                                                                                     

2. 将(2)句译成中文。

                                                                                                                                                    

B. 根据短文内容,简要回答问题。

                                                                                                                                                    

3. 在(3)句的空白处分别填入一个适当的词使句意完整、上下文通顺。

                                                                                                                                                    

4. 在文中找出与下面句子意思相近的句子。

    Most teachers think it is dishonest of students to talk about something when they are having an exam. 

                                                                                                                                                    

5. 在文中找出最能表达该短文主题的句子。

                                                                                                                                                    

单项选择题