Passage 5
What makes an astronaut?
Being an astronaut is no easy job. 1.
Astronauts need to (be)
· between 25 and 35 years old
· 160 to 172 cm tall
· weigh 55—70 kg
Test 1: Stand strong g-forces(重力)
Usually, people can stand g-forces of 3G to 4G. 2. That is to say, their body feels eight times heavier than usual. This can make them feel bad. Tears run from their eyes and they can hardly breathe(呼吸).
Test 2: 3
Astronauts train(训练) by sitting on a fast-spinning(快速旋转的) chair or a big “swing” for 15 minutes. Sometimes, they can feel sick or even vomit(呕吐).
Test 3: Be ready for the weightless environment(失重环境)
To create a weightless environment on the earth, astronauts train inside a water tank. There, they stay afloat while moving around or carrying tools. 4. After training, some of them are even too tired to hold chopsticks.
A. Astronauts are in good health.
B. But astronauts need to stand forces of up to 8G.
C. Keep a good balance(平衡).
D. Every time, they train in the tank for about six hours.
E. They need to take some hard tests(测试).

1.E 2.B 3.C 4.D

Passage 6
新素材 科普知识 Why do you seldom see windows in supermarkets? 1
One of them is that supermarkets try to keep people inside longer. “People won't see the outside world easily,” says a shopkeeper. “You won't know if it is rainy or sunny outside. You may even forget(忘记) that someone is waiting for you outside. 2” It really gives you an immersive(沉浸式的) shopping experience(体验).
Keeping daylight out of supermarkets can also help store products(储存商品). 3 Too much sunshine can even make some products look not as new as before.
Having windows in the supermarkets would take up the space to put products. “4 They can hold some heavy shelves(架子),” says a building worker.
What's more, windows cost much and the owners of supermarkets want to keep the building costs lower. 5 Bad guys may come into their supermarkets through the windows.
A. The walls are always strong.
B. There are some reasons(原因).
C. Also windows may not be safe enough.
D. All you care about is shopping inside.
E. People like hanging(挂) things on the windows.
F. That is because some food can go bad faster in sunlight.
G. It doesn't look pretty with too many windows around in a supermarket.

1.B 2.D 3.F 4.A 5.C