How will scientists confirm the existence of life on Mars？
A. By sending unmanned spacecraft to Mars
By looking at fossils on Mars
C. By viewing pictures taken of Mars
D. By studying the present conditions on Mars
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"Pop-up" stores can help to fight against economic gloom because they
A. appear for a short time and then vanish.
B. attract and urge consumers to make prompt purchase.
C. cut the extra expense of running stores.
D. are proved effective by online retailers.
【C20】
A. stimulate
B. constitute
C. furnish
D. provoke
【C7】
A. emotion
B. fancy
C. likeliness
D. judgment
The word originated in the passage is closest in meaning to
A. turned
B. changed
C. begun
D. disappeared
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