单项选择题

In Disneyland, every year, some 800 000 plants are replaced because Disney refused to______ signs asking his "guests" not to step on them.

A．put down
B．put out
C．put up
D．put off
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单项选择题
My train arrives in New York at eight o'clock tonight. The plane I would like to take from there______ by then.
A．would leave
B．will have left
C．has left
D．had left
单项选择题
Professor Taylor's talk has indicated that science has a very strong______ on the everyday life of non-scientists as well as scientists.
A．motivation
B．perspective
C．impression
D．impact
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