爱华网The rockets take astronauts and man-made satellites into space. The satellites are used for
communication, weather monitoring and research. But how do satellites stay up without falling down?
There are two opposite forces (力量) acting on the satellite. One of them is the force of gravitation
(地心引力), which tries to pull the satellite towards the earth. The other force is created by the rotation (旋转) of the satellite around the earth. This force tries to take the satellite away from the earth. With
these two forces, the satellite goes round and round. The gravitational pull of the earth (the force which
pulls everything towards the ground) is like a rope which keeps the satellite from flying away.
Everything that goes up has to come down. It is only a matter of time before a satellite comes back
to the earth. As time goes by, the satellite loses its speed, which makes the gravitational pull stronger
than the force pulling it away. This makes the satellite crash (坠落) down to the earth. 1. Which of the following uses of satellites is NOT mentioned?A. communication
B. monitoring the weather condition
C. doing some research
D. taking pictures 2. The force that pulls the satellite towards the earth is created by ________.A. the earth
B. the satellite itself
C. the rotation of the satellite
D. the rope3. Why can't the satellites fly away?A. Because of the force from the earth.
B. Because the satellite is too big.
C. Because of the force created by the rotation of the satellite around the earth.
D. Because people on earth have made ropes to tie the satellites tightly.4. The satellite will finally crashes down to the earth ________.A. when it flies faster
B. when its speed slows down
C. when people cut the rope
D. when there is no electricity in it5. Which of the following is TRUE according to the passage?A. There are four forces acting on the satellite.
B. The force of gravitation makes the satellite go round and round.
C. As time goes by, the satellite will finally fall down.
D. The satellite will stay in space forever.题型：阅读理解难度：中档来源：山东省中考真题
1-5 DAABC
考点：
考点名称：科教类阅读科普类的阅读：
科普类的阅读理解包含介绍科学知识、社会知识的短文。阅读这类短文时，要以事实为中心进行思考，抓住事物的特征、用途、相互关系等。
如果是介绍社会现象的文章，要掌握所谈现象的内涵。答题技巧：
1. 加强整体意识，把握文章的主要内容。在阅读的时候可给段落标上序号，并给重要的句子和
关键词做上记号，尤其是各段中心句，为答题提供更快捷更多的信息源。
2. 审清题干，发觉和把握试题中有效的提示性信息，确认命题的角度、阅读范围和答题方式。
3. 定位阅读，强化对应意识。同时要注意原文利用和自我加工相结合。
