题目内容
（请给出正确答案）
Once environmental damage_____, it takes hundreds of years for the system to recover.
A．has done
B．is to do
C．does
D．is done
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更多“Once environmental damage_____, it takes hundreds of years for the system to recover.A．has”相关的问题
A.is to do
B.does
C.had done
D.is done
Once environmental damage ______, it takes many years for the system to recover.
A．has done
B．is to do
C．does
D．is done
Once environmental damage , it takes many years for the system to recover.
A．had done
B．is done
C．is to do
D．does
Once environmental damage ______, it may take many years for the system to recover. A．has done B．is to do C．is done D．does
A．Certain organs are more reponsive than others to the hormones created by environmental pollutants.
B．The incidence of breast cancer correlates with the presence of environmental pollutants.
C．A great deal of evidence has been amassed linking environmental pollutants with cancer in animals.
D．Cancer diagnosis has become more reliable than it once was.
E．Cancer of the liver, an organ that is hormonally responsive to environmental pollutants, is rising globally.
What is the main idea of the passage？
A．Scientific appraisal shows that multifactorial diseases are often due in part to environmental conditions.
B．In the past half century, scientists have been able to find only a few principles that apply to all diseases.
C．Each disease has single underlying mechanism that must be understood before the disease can be cured.
D．Many diseases that were once life-threatening can now be cured by antibiotics.
Section A
Directions: In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A , B, C, and D.
Once environmental damage ______, it takes many years for the system to recover.
A．has done
B．is to do
C．does
D．is done
SECTION C NEWS BROADCAST
Directions: In this section you will hear everything ONCE ONLY. Listen carefully and then answer the questions that follow. At the end of each news item, you will be given 10 seconds to answer the questions.
听力原文： A United Nations conference has adopted measures to speed up global action to protect people and the environment from hazardous wastes. The measures were adopted at a conference in Geneva called to strengthen the Basel Convention, a U.N. treaty that laid down environmental standards for the disposal and management of hazardous wastes.
The United Nations estimates the world produces around 150 million tons of hazardous waste each year. The major achievement of the conference, which concluded Friday, was the adoption of a strategic plan to deal with all this waste.
Around how many tons of hazardous waste does the world produce each year？
A．150 million.
B．1.50 million.
C．15 million.
D．50 million.
SECTION C NEWS BROADCAST
Directions: In this section you will hear everything ONCE ONLY. Listen carefully and then answer the questions that follow. At the end of each news item, you will be given 10 seconds to answer the questions.
听力原文： A coalition of environmental groups has urged the United Nations to do more to limit noise pollution deep in the oceans because they said it's harming whales and dolphins. The Ocean Noise Coalition says the intense sound caused by underwater explosions, oil and gas exploration and sonar navigation needs to be curbed. Martin L has more details.
"The physical pollution of the oceans has long concerned scientists, but increasingly noise pollution is being regarded as possibly an equal threat to marine life.
The pitiful sight of great sea mammals like whales and dolphins being washed ashore in large numbers for no obvious reason has got public opinion demanding an answer from the scientists.
The phenomenon could be caused by cyclical weather patterns. But researchers in several parts of the world are now frequently linking the mass strandings to underwater noise of extremely high volume caused by humans."
According to the report, the sound sources that need to be restrained do NOT include ______.
A．underwater explosions
B．oil and gas exploration
C．whistling of ships
D．sonar navigation
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