题目内容

【题目】被称为“红土地”的是  地区;四川盆地被称为“  ”.

【答案】南方;紫色盆地

【解析】红土位于南方地区,是指长江以南的广大丘陵地区,土壤较为贫瘠,所以被称为“红土地”的是南方地区;四川盆地因为地表多出露紫红色砂页岩,所以有 “紫色盆地”之称。

练习册系列答案
相关题目

【题目】

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 acting on the satellite. One of them is the force of gravitation(地心引力), which tries to pull the satellite toward 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 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.

1The force that pulls the satellite towards the earth is created by ________.

A. the earthB. the satellite itself

C. the rotation of the satelliteD. the rope

2Why 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.

3Which 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.

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网