多项选择题

1. 说明这一现象
2．解释产生这种现象的原因
3．预测未来的趋势
(说明：中国游客出国旅游开始于1997年。据统计，当年全国出境旅游的人数为520万人次，到2006年出境旅游的人数已超过3000万人次。)
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单项选择题
According to Mr. Gilmore the spread of snakehead is ______.
A．based on legal means
B．by illegal means
C．in an Asian fish store's favor
D．out of economic consideration
单项选择题
How many states in the U.S.A have been threatened by snakeheads A) Three C) Five B) Four D) Six
A．How many states in the U.S.A have been threatened by snakeheads
B．Three
C．Four
D．Five
E．Six
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