单项选择题
In the writer's opinion, ______, or the forests slowly disappear.
A．measures must be taken
B．people shouldn't draw benefit from trees
C．government must realize the serious results
D．unless trees never be cut down
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单项选择题
In summer, visitors will have ______ to visit Ellis Island.
A．no enough time
B．longer time
C．shorter time
D．a wonderful time
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单项选择题
We may infer from the passage that ______.
A．visitors prefer to go to Ellis Island by boat
B．there are more visitors in winter
C．Ellis Island is open every day
D．boat is the only transportation to Ellis Island
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