完形填空。 Now in some places of our country,  many  people  are cutting down (砍 伐) the trees in the forests. They need more 1 to build houses and more farmland to grow crops and so on. The areas of forests are getting 2 . Some scientists say that there 3 no big forests in 20 or 30 years. It is really a(n) 4 thing. 5 the forests, we will have sandstorms(沙尘暴) often. The weather will get 6 . The earth will become a big desert(沙漠). A lot of plants and animals will 7 . Crops will not grow anywhere. Life will be 8 for everyone. So we should do our best 9 our living environment and keep our mountains 10 , the water clean, and the sky blue. (     )1. A.wood (     )2. A.bigger and bigger (     )3. A.has (     )4. A.excited (     )5. A.With (     )6. A.wet and cold (     )7. A.come (     )8. A.difficult (     )9. A.protect (     )10.A.clear B.money B.less and less B.have B.happy B.Under B.hot and dry B.live B.easy B.to protect B.fresh C.deserts C.smaller and smaller C.will have C.better C.Within C.cold and dry C.die C.enjoyable C.protecting C.green D.leaves D.more and more D.will be D.terrible D.Without D.hot and wet D.turn D.poor D.protected D.blue