问题 选择题

跳水运动员从10m高的跳台上跳下,在运动员下落的过程中(     )

A.运动员的动能增加,重力势能增加

B.运动员的动能减少,重力势能减少

C.运动员的动能增加,重力势能减少

D.运动员的动能减少,重力势能增加

答案

答案:C

题目分析:在运动员下落的过程中高度降低,重力势能减少,速度增加,动能增加,C对

点评:本题只要是考查学生对功和能量变化的关系的理解,重力做的功等于重力势能的减小量,动能的变化要根据合外力做功判断

多项选择题 案例分析题
阅读理解

阅读理解。

     When first entered, Vanak Restaurant does not look like much of a restaurant, but once the pleasant

smells of kabob (烤肉串) hit the senses, you are incapable of calling it anything less.

     Owned by a local couple, this Persian restaurant has an inviting, homelike atmosphere that many

restaurants lack. The space is small with only a few dining tables and nearly no decoration, but the

environment is truly charming. Lying in a hardly noticeable street corner, the restaurant still attracts all

customers, especially those experienced in the delights of Middle Eastern cooking.

     A common sight is that of old Persian men sitting in the corner talking loudly about world topics,

watching news events on TV, drinking a black tea known as Persian chai, reading local Persian

newspapers all the while and trying to finish off their plate piled with food.

     The variety of food at the restaurant is limited, but the amount of each dish is fairly large. Most of the

meals can serve two people and are under $10, so not only is it affordable but practical as well. The

food, especially appeals to health-conscious eaters because each dish is very healthy, made with limited

fat and oil and served straight off the grill (烤肉架).

     The main dish that the restaurant is popular for is its kabobs, which are different styles of grilled meat. One delicious and extremely healthy dish is the Joojeh Kabob, which is made of grilled chicken pieces

served with either rice or bread. Another great kabob is the Chelo Kabob, a kabob consisting of grilled

beef.

     Although the restaurant is small, the atmosphere and the food is delicious. It is a place that should not

be overlooked.

1. When first entering the restaurant, one can find that it________.

A. is splendidly decorated

B. has pleasant smells of kabobs

C. is crowded with dining tables

D. looks like a common restaurant

2. What activity is also mentioned apart from dining in the restaurant?

A. Watching news events on TV.

B. Drinking a kind of black coffee.

C. Reading local English newspapers.

D. Discussing world topics in low voices.

3. What is the dish Joojeh Kabob mainly made of?

A. Rice  

B. Chicken

C. Bread  

D. Beef

4. It can be inferred from the passage that the restaurant _______.

A. occupies a large space

B. owns a favorable location

C. is popular for its special food

D. has a quiet environment inside