In the passage, the writer tries to explain ______.
A. the life cycle of a tree
B. the way trees survive
C. the importance of trees to human progress
D. the dangerous trees face from natural disasters
According to the passage, a novel must be about ______.
A. kings
B. what happens in a single day
C. soldiers in battle
D. people
The story is mainly about______.
A. a bad-tempered man and his lake
B. a famous lake that everyone liked
C. a lake that needed repairing
D. people who lived near a lake
【B7】
A. began
B. started
C. had
D. happened
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