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
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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
Who has a more developed culture according to the speaker?
A. Mayans.
B. Arabians.
C. North American Indians.
D. British.
The effect of TV is particularly strong on younger viewers.
A. True
B. False