What is the sky(天空)? Where is it? How high is it? What lies above it? These questions are hard to answer, aren’t they?

    Is the sky blue? The sky has no color. We know that there is air around the world. When planes fly, they need air to lift their wings(翼) . Planes cannot fly very high because when they go high, the air gets thinner. If we go up about 1,200 kilometers from the earth, we find there is no air.

    Perhaps(也许) we can answer some of our questions now. The sky is space(空间). In this space there is only the sun, the moon and all the stars.

6.What is the sky?

A. It’s the clouds       B. It’s space.     C It’s air      D It’s nothing

7. The sky _____

A. is blue        B. is white        C. is black     D. has no color

8. Planes cannot fly very high because _________.

A. the air becomes thinner                         B. the flying machine is not good       

C. people will be afraid if the planes fly too high      D. it is not necessary for planes to fly so high

9 If we go up about 1,200 kilometers from the earth, we find ___________.

A. there is more air   B. there is less air   C .there is nothing but air   D there is no air

10. In space there is _________.

A. nothing       B. air everywhere       C. everything       D. only the sun , the moon and all the stars

句型转换
【小题1】He was late for school because it rained heavily. （同义句）
He was late for school _________ __________ the heavy rain.
【小题2】English isn’t as difficult as Maths. （同义句）
Maths is _________ _________ _________ English.
【小题3】How high is the building? （同义句）
_________ is _________ _________ of the building.
【小题4】Amy is 160 centimeters tall. Tom is 155 centimeters tall.( 合并句子 )
Tom is _________ _________ Amy.
【小题5】Sam, a little, is, generous, more, than, his classmates ( 连词成句 )
                                                         

_____does it takes to get to school? Half an hour..

A. How many B. How far C.How long D. How high

Look, ________ the car __________!

Look,                   the roller coaster                !