Why are national parks important to American environmental policy as a whole？
A. Because they are a part of the environment.
Because of twenty-five years of progressive environmental legislation.
C. Because they set the standard for land stewardship in America.
D. Because millions of people visit them each year.
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According to the text, proposed legislation could______.
A. raise awareness of the needs of national parks
B. allow roads to go through national parks
C. eliminate national parks
D. help save national parks
变压器是供配电系统中的重要设备,为此需要根据变压器容量大小及其重要程度装
设各种专用的保护,现有6300KVA/35/ 10.5KV变压器一台,哪几种保护是必需的:（）
A 定时限过电流
B 过电流速断
C 纵联差动
D 气体、温度监控
The authors purpose in writing this text is______.
A. to describe recent environmental policy
B. to point out the difficulties inherent in protecting national parks
C. to call for the protection of national parks
D. to analyze the current status of national parks
According to the article, which of the following is an example of a "career-oriented" high
A student who decides to not finish high school.
B. A student who plans on joining the Army.
C. A student who works while in high school.
D. A student who is proficient in reading.
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