American scientist say that they believe trees can warn eachother of danger releasing chemicals into the air.__1__ Thetheory was announced by the National Science__2__Foundation is the result of studies carried out by scientist in thestates of Washington and New Hampshire. The scientists saidthey found that when trees are against attack by disease orinsects, nearby__3__ trees take the same offensive actions asthe trees__4__ being attacked. And they said it appears that the trees being attacked mayproduce and send out chemicals to warn the other trees. A United Nations'report says Asiancountries are faced major environ-__5__ mental problems. The report released in Bangkok saidthat parts of China, India, Iran, Afghanistan and Pakistan were threatened by man-made andnatural__6__ events that turn productive land into deserts. I said the most serious threat againstthe area is the rapid expansion of Asia's rain forests, or woods, especially__7__ in Malaysia, thePhilippine and Thailand. The report said the reduction in woods areas have already led to __8__increased flooding, water shortages in the dry seasons and the loss of farm lands. A top UN officialsaid that as much as 70% of the woods in Asia would be gone in__9__ 20 years unless actions aretaken now to save it.__10__
參考答案及解析:
1. 在releasing前加by。用by引導releasing chemical into the air，作方式狀語
2. 刪除was或在was之前加which/that?；蜻^去分詞announced或用which/that was announced 做定語修飾the theory。Thetheory的謂語動詞為is
3.against—under。習語(be)under attack，受攻擊
4. offensive—defensive。根據(jù)常識，當生物收到外界的威脅時，也會進行自衛(wèi)
5. faced—facing或在faced之后加with。動詞face作“面臨、應對”解時，有兩種結構：被動態(tài)“主語+be+faced with+賓語”，主動態(tài)“主語+face+賓語”
6. were—are。報告的發(fā)布是在過去的某個時候，所以主語中的謂語動詞發(fā)生在過去時，但報告的內(nèi)容陳述的是一個事實，謂語動詞應該是一般現(xiàn)在時
7. expansion—shrinking。與上文“可耕地變成沙漠”一樣，亞洲的雨林面臨快速減縮，而不可能擴大，而且下文中有the reduction in woods areas
8. have—has。主語為the reduction in woods areas
9. would—will。UN官員陳述的是一個完全可預見的事實
10. it—them。them指代the woods