单项选择题
According to the passage the low-Earth orbit is ______.
A.the destination for most commercial payloads
B.a few hundred kilometers above the earth
C.about 36,000 kilometers away above the earth
D.a few hundred kilometers above the stationary orbit
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单项选择题
It can be inferred that the toy industry ______.
A.must have gained abundant profit
B.plays a vital role in promoting the early-year education
C.has sponsored the neuroscience research
D.has stimulated children's desire for toys
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单项选择题
What is the author's attitude toward educational toys
A.Indifferent.
B.Negative.
C.Positive.
D.Tolerant.
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