单项选择题

One reason it is difficult to know why the whales are dying is that （）

A. the whales travel such a long distance
B. there are more whales than there used to be
C. the whale bodies are too old to study by the time they are found
D. the whales are endangered

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热门试题

单项选择题

Keeping the places clean and tidy （）

A. might increase terrorist attacks
B. might prevent from terrorist attacks
C. might encourage terrorist attacks
D. might make terrorists confused

单项选择题

The police stopped Mr Williams because（）

A. there was a stop sign that Mr Williams ignored
B. the police was not sure whether Mr Williams had a driving license
C. the police thought that he was at a different crossroads with a stop sign on it
D. there was a slow sign that Mr Williams ignored