单项选择题

Which of the following statements is NOT true

A．Elephants can be graceful.
B．Tigers are too dangerous to be trained.
C．Animals which are natural enemies can be trained to live together.
D．Animals can become interested in their tricks.

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单项选择题

According to the author, policemen view their profession as ______.

A．dangerous but adventuresome
B．full of corruption
C．full of routine
D．worth the effort

单项选择题

Ricci is compared to Columbus in the passage mainly because ______.

A．they both benefited from Italian sponsors.
B．they were explorers in their own ways.
C．they obtained overseas sponsorship.
D．they got a warm reception in Americ