阅读理解。
Mrs Black, the wife of a rich business man, invited some of her friends to have lunch, She wanted to
try a new way of cooking a fish, and she was very pleased with herself when the dish was ready. As the
dish was very hot, she put it near the open window to cool for a few minutes, But, five minutes later,
when she came back for it, she was shocked(震惊) to find the neighbor's cat at the dish. She was in time
to stop the cat. That afternoon was successful but everyone enjoyed the dish very much. They talked and
laughed till four o'clock.
At the end of the afternoon, when she was alone again, Mrs Black felt tired but happy. She was in a
chair just near the window. She looked out of the window and shocked to see the neighbor's cat dead
in her garden. Why, the fish dish must be bad! What would happen to her friends? She at once
telephoned the family doctor for advice. The doctor told her to telephone each of the visitors to meet
him at the hospital as soon as he could. Finally the danger was over. Once again Mrs Black was alone
in her chair in the sitting-room, still tired but no longer happy. Just then the telephone rang. It was her
neighbor."Oh, Mrs Black," her neighbor cried, "My cat is dead. She was killed by someone in a car and
put it in your garden. "
1. Mrs Black invited to have lunch.
A. Mr Black's friends
B. her neighbor
C. her parents
D. some of her friends
2. Why was Mrs Black not happy after she had a good party?
A. She was sad about the dead cat.
B. She found her fish dish was bad.
C. She never thought that she would have so much trouble.
D. She felt tired after she had a busy day.
3. Mrs Black .
A. stopped the cat before it began to eat the fish
B. was too late to stop the cat in time
C. stopped the cat before it ate the fish up
D. stopped the cat but it was too late
4. Why was Mrs Black so shocked to see the cat dead in her garden?
A. She liked the cat very much.
B. She worried about her friends.
C. She was sure that her fish was bad.
D. She didn't know how the cat died.
5. Finally .
A. Mrs Black found that all her friends were all right
B. a visitor told her that the cat was killed by someone in a car
C. Mrs Black felt happy as all her friends were safe
D. Mrs Black met all her friends at the hospital
2007年10月24日，我国成功地发射了“嫦娥一号”探月卫星，其轨道示意图如下图所示.卫星进入地球轨道后还需要对卫星进行10次点火控制。第一次点火，抬高近地点，将近地点抬高到约600km，第二、三、四次点火，让卫星不断变轨加速，经过三次累积，卫星加速到11.0km/s的速度进入地月转移轨道向月球飞去.后6次点火的主要作用是修正飞行方向和被月球捕获时的紧急刹车,最终把卫星送入离月面200km高的工作轨道(可视为匀速圆周运动).已知地球质量是月球质量的81倍,R月="1800km" ,R地=6400km,卫星质量2350kg ,地球表面重力加速度g取10m/s2 . （涉及开方可估算，结果保留一位有效数字）