专业八级改错练习 第92期

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__