The writer thinks that ______.
A. in the heavens there may be other worlds inbabited by intelligent beings
B. human beings are as supreme as the intelligent beings in outer space
C. maybe human beings are not so supreme as the beings from other civilizations in the universe
D. both A and C
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A．He is late for the appointment with his advisor.B．He is late for the biology class.C．
A. He is late for the appointment with his advisor.
B. He is late for the biology class.
C. He is not able to complete the outline next week.
D. He hasn't finished the outline assigned by the advisor.
People who ask the question "Why don't they get in touch with us ... and declare themselves？" think that ______.
A. there are no such things as UFOs
B. UFOs are visitors from solar system
C. there's no reason for UFOs not to land on Earth
D. we are bound to see UFOs sooner or later
经国务院批准，《全民健身计划纲要》于1996年6月28日正式______实施。 填入划横线部分最恰当的一项是()。
A. 发布
B. 公布
C. 颁布
D. 宣布
一线偏振光通过λ／4波片后，出射光仍为线偏光。
A. 正确
B. 错误
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