单项选择题

Passage One

A. There is few evidence proving their existence.
B. They are difficult to verify due to their mobility.
C. People cannot live long enough to get them.
D. Current devices have limitation in locating them.
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单项选择题
A. The warm weather.B. Clothes to wear.C. Best material for making a dress. D. Delicious food.
A. The warm weather.
B. Clothes to wear.
C. Best material for making a dress.
D. Delicious food.
单项选择题
A. Go skiing in the Alps. B. Visit his fiends in England.C. Go shopping in London. D. Go swimming in Germany.
A. Go skiing in the Alps.
B. Visit his fiends in England.
C. Go shopping in London.
D. Go swimming in Germany.
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