练习：
1. What color is the sky?
A) It is blue.
B) It is white.
C) It is grey.
D) It has no color.
2. When an airplane flies too high,
A) the air will be too thin to support its wings.
B) the air will become thicker.
C) the air will exert pressure on it.
D) the air will disappear in no time.
3. A rocket can fly to the moon because
A) it looks like a balloon.
B) it is much lighter than an airplane.
C) it doesn't have wings.
D) it works like an untied balloon.
4. Which of the following statements about a rocket is NOT true?
A) It can fly when there is no air.
B) It can fly without wings.
C) It is made of strong metal.
D) It is propelled by burning gas inside it.
5. A rocket is pushed up into the air when
A) hot gas rushes out of its head.
B) it is powered by gas.
C) hot gas rushes out of its bottom.
D) hot gas rushes out of its neck.
Keys: DADDC
