American scientist say that they believe trees can warn each other of danger releasing chemicals into the air.__1__ The theory was announced by the National Science__2__ Foundation is the result of studies carried out by scientist in the states of Washington and New Hampshire. The scientists said they found that when trees are against attack by disease or insects, nearby__3__ trees take the same offensive actions as the trees__4__ being attacked. And they said it appears that the trees being attacked may produce and send out chemicals to warn the other trees. A United Nations'report says Asian countries are faced major environ-__5__ mental problems. The report released in Bangkok said that parts of China, India, Iran, Afghanistan and Pakistan were threatened by man-made and natural__6__ events that turn productive land into deserts. I said the most serious threat against the area is the rapid expansion of Asia's rain forests, or woods, especially__7__ in Malaysia, the Philippine 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 official said that as much as 70% of the woods in Asia would be gone in__9__ 20 years unless actions are taken now to save it.__10__
【答案】
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.或過去分詞announced或用which/that was announced 做定語修飾the theory.The theory的謂語動詞為is
3.against—under.習語（be）under attack，受攻擊
4. offensive—defensive.根據常識，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)布是在過去的考試大某個時候，所以主語中的謂語動詞發(fā)生在過去時，但報告的內容陳述的是一個事實，謂語動詞應該是一般現在時
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
【答案】
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.或過去分詞announced或用which/that was announced 做定語修飾the theory.The theory的謂語動詞為is
3.against—under.習語（be）under attack，受攻擊
4. offensive—defensive.根據常識，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)布是在過去的考試大某個時候，所以主語中的謂語動詞發(fā)生在過去時，但報告的內容陳述的是一個事實，謂語動詞應該是一般現在時
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