[单项选择]It is only recent years that man found that the protection of our environment is no small matter to our fives.
A. 直到近年来人们才发现，保护环境对我们的生存至关重要。
B. 直到近年来人们才发现，环境保护在我们的生活中并不是一件小事。
C. 只需几年人们就会发现，环境保护不过是生活中的一件小事。
D. 直到前几年人们才发现，保护环境在我们的生活中不是一件容易的事情。

[单项选择]It is only in recent years that man found that the protection of our environment is no small matter to our lives.
A. 只有在近年人们才发现，保护环境对我们的生存至关紧要。
B. 只在前几年人类才发现，环境保护是我们生活中必不可少的。
C. 只有几年人们就会发现，环境保护不过是生活中的一件小事情。
D. 只需要几年人类就会发现，保护环境事情虽小，生活中却不易实现。

[单项选择]

Text 1

In recent years scientists have found that the laser has a wide variety of applications, making it one of the most important inventions for improving our quality of life.
One important field in which the laser has many applications is communications. Scientists have found that the laser beam can transmit human voices; as a result, telephone companies are now using laser light signals to transmit telephone calls through extremely small cables that are capable of carrying many more transmissions than the standard telephone cables. An additional advantage is that these systems using the laser light signals are also able to transmit video telephone conversations.
Another, perhaps less-known, field in which lasers are helping improve the quality of life is metrology—the science of measurement. The extremely straight, narrow laser beam can be used to put the parts of a structure being built into the correct position to each other
A. standardize telephone cables
B. remove communications jams
C. improve the quality of human voices
D. increase the capacity of communications

[单项选择]Only in recent years have people begun to realize the importance of wildlife protection.
A. 直到近年来人们才越来越意识到保护野生动物的重要性。
B. 只是在最近几年里人们才开始发现并保护了很多重要的野生动物。
C. 直到近年来人们才开始意识到保护野生环境的紧迫性。
D. 直到近年来人们才开始了解保护野生动物的重要性。

[填空题]It is only in recent years that people have begun to know about wind power.

[填空题]Only in recent years ______ (人们才认识到节约用水多么重要).

[填空题]Only in recent years ______(人们才开始认识到保护野生动物的重要性).

[单项选择]

Although recent years have seen substantial reductions in noxious pollutants from individual motor vehicles, the number of such vehicles has been steadily increasing. Consequently more than 100 cities in the United States still have levels of carbon monoxide, particulate matter, and ozone (generated by photochemical reactions with hydrocarbons from vehicle exhaust) that exceed legally established limits. There is a growing realization that the only effective way to achieve further reductions in vehicle emissions--short of a massive shift away from the private automobile—is to replace conventional diesel fuel and gasoline with cleaner-burning fuels such as compressed natural gas, liquefied petroleum gas, ethanol, or methanol.
All of these alternatives are carbon-based fuels whose molecules are smaller and simpler than those of gasoline. These molecules burn mom cleanly than gasoline, in part because they have fewer, if any, carbon-carbon bonds, and the hydrocarbons t
A. It is substantially less expensive than ethanol.
B. It could be provided to consumers through the existing motor fuel distribution system.
C. Its use would substantially reduce ozone levels.
D. Its use would make design improvements in individual vehicles feasible.