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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热门试题

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

单项选择题

What is the author's attitude toward educational toys

A．Indifferent.
B．Negative.
C．Positive.
D．Tolerant.