单项选择题

The purpose that the writer wrote this article for is （）

A．to tell people that trees are very useful to man
B．to warn people not to cut down trees any more
C．to warn that man mustn't destroy forests any more
D．to explain how trees help to prevent drought and floods

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单项选择题

According to the article we know it is （） to prevent the forest from slowly disappearing.

A．necessary but impossible
B．necessary but difficult
C．impossible and unimportant
D．difficult and impossible

单项选择题

Which of the following is NOT true（）

A．People can visit Ellis Isalnd free of charge.
B．The boat departure time from battery Park is at 9:15a. m. all the year round.
C．Ferry fees for children are cheaper than for adults.
D．Ferry fees for group visitors can be discounted (折扣).