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【单选题】
研究表明,地球自转在逐渐变慢, 3 亿年前地球自转的周期约为 22 小时。假设这种趋势会持续下去,地球的其他条件都不变,未来人类发射的地球同步卫星与现在相比( )A.
距地球的高度变大
B.
向心加速度变大
C.
线速度变大
D.
加速度变大
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【简答题】A．Because the insects are the most successful creatures. B．Because the insects give birth all the time. C．Because the insects can adapt to new situations quickly. D．Because the insects were the first ...
【单选题】____________ they ____________ in the forest? Yes, they are. [ ]
A.
Do, watch insects
B.
Are, watching insects
C.
Did, watch insects
【单选题】Which of the following is not true about insects?
A.
Insects can see more colours than human beings.
B.
Insects can see ultraviolet rays which are invisible to man.
C.
All insects have their favorite colours.
D.
The world is more colorful to insects than to human beings.
【单选题】Which of the following is NOT true about insects?
A.
Insects can see more colours than human beings.
B.
Insects can see ultraviolet rays which are invisible to men.
C.
All insects have their favorite colours.
D.
The world is more colorful to insects than to human beings.
【单选题】In many countries insects are not eaten because ______.
A.
insects are very dirty
B.
insects are very ugly
C.
insects are very difficult to digest
D.
A and
【单选题】In the war, a soldier’s life is full of ________.
A.
hazards
B.
cosmetics
C.
transfusion
D.
bioterrorism
E.
disorders
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