Carbon dioxide,which makes a________between us and the sun,prevents heat from getting out of the atmosphere easily,so the earth is becoming warmer.
282. Our earth, one planet of the solar system, is only a very small part of the__________.
281. Many hands make light work.__________ is strength.
280. Take on a(n)__________ with you. It looks like raining.
279. The Palace Museum has many art treasures. In this sentence, "treasure" means ____.
278. The road constant improvements can’t keep pace with the increasing ____ .