问题
单项选择题
Directions: There are 10 blanks in the following passage. For each numbered blank, there are four choices marked A, B, C and D. Choose the best one and mark your answer on the ANSWER SHEET with a single line through the center.
| Our planet is like a bit spaceship. Our atmosphere acts (51) a shield against harmful radiation and space debris. (52) holds the air and people on the spaceship, (53) everything doesn’t float away. Each of us is an astronaut and our spaceship, the earth, provides our food and water. The sun is our energy (54) and without it we would not be able to survive. (55) every spaceship, the earth is a closed system. The only thing we receive from the outside is energy from the sun. Everything else must be used (56) again. We astronauts don’t seem to realize that this spaceship is the (57) one we’ve got. We (58) its resources and waste the energy the plants have stored from the sun. If we (59) our spaceship, we will destroy ourselves as well. Maybe if we look at the universe which surrounds us, we will appreciate our own spaceship more and take (60) care of it. |
A．for
B．with
C．as
D．like
答案
参考答案：C
解析： 本文把我们的行星(即地球)比做飞船，本句说大气层作为屏障，起着阻挡有害辐射和宇宙碎片的作用。act as意为“充当，担任，起……的作用”，正合题意。act like意为“像……一样”；act for意为“代理”。with加某些抽象名词可做状语修饰act(如：act with caution谨慎地行事)，此三选项在此均不恰当。
clothes within 24 hours. Ask the room staff to collect them.