What is unusual about the island of Martha's Vineyard？
A. It was settled more than 300 years ago.
B. Alexander Graham Bell visited there.
C. A large number of its residents were deaf.
D. Each family living there had many children.
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正确答案是（）
A. of
B. for
C. beyond
D. into
The neutrinos are hard to detect most probably because of
A. their ability to escape from different regions of space.
B. their inability to penetrate dense matter.
C. the similarity of their structure to that of nucleons.
D. the infrequency of their interaction with other matter.
About 50 percent of the nation's electricity was generated by
A. gas-fired power plants.
B. coal-fired power plants.
C. water generated power plants.
D. wind-generated power plants.
What protects the sea dragon from a meat eater's attack？
A. Its enormous size.
B. Its plant-like appearance.
C. Its instantaneous response.
D. Its offensive smell.
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