Question

Have you ever wished that you could brush your teeth while you’re moving? It turns out that scientists have the answer. There’s a special kind of edible toothpaste（牙膏）you can actually eat. You can use it to brush your teeth and eat it afterward. Without the need to spit（吐出）, edible toothpaste is really convenient.

　 NASA invented edible toothpaste in the 1960s. They made it for astronauts in space and people called it “the astronaut toothpaste”. This is because spitting out toothpaste in space can be dangerous. Without gravity（重力）it can go everywhere and can damage spacecraft computers if it gets inside them. Edible toothpaste doesn’t foam（起泡沫）either so there is no mess.

　 If you don’t like the sound of edible toothpaste, there’s also a special toothbrush you can buy. When people travel to a place without water, they often use it. You just need to chew and it cleans your teeth just like you are using a normal brush. After you finish brushing your teeth, you spit it out and get rid of it. No mess and no worries.

(　　 )73. The Chinese meaning of the word “ edible ” in Paragraph 1 is ________.

A. 可以用的　 B. 可以吃的　　 C. 可以喝的　　　 D. 可以買的

(　　 )74. If people spit out normal toothpaste in space, ________.

A. it will fall down to the ground　 B. it doesn’t foam and there’s no mess

C. it’s bad for the astronaut’s health D. it may cause problem for the spacecraft

(　　 )75. According to the article, which is NOT true about edible toothpaste?

A. It’s very convenient.　　 B. You can eat it.

C. You can spit it out.　　　 D. You can use it many times.

(　　 )76. The last paragraph mainly talks about 　　　 .

A. water　　 B. a normal brush　 C. a special toothbrush　 D. edible toothpaste

Answer 1

BDD  C