单项选择题

From paragraph 4, we can deduce that______.

A．the speed of computers is faster than ever
B．scientists encounter unprecedented difficulties
C．the intelligence of computers is more important than the speed
D．there is much room for the improvement of computer intelligence

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单项选择题

What have given mankind a new viewpoint on the earth and its neighbors in space

A．Those explorations.
B．The advance of new technologies.
C．Spacecraft studies.
D．Scientific discoveries.

单项选择题

In the passage, the author wants to tell us ______.

A．that people dreamed of leaving their home planet and exploring other worlds became reality
B．after the Apollo program, the emphasis in piloted missions shifted to short-duration spaceflight
C．space exploration is a great challenge to human beings and will be achieved through generation's work
D．today efforts focus on keeping people healthy during space missions and in increasing the cost of sending satellites into orbit