单项选择题

The shark's best sense is smell because ______.

A．most of its brain is used for this purpose
B．it is colour blind
C．it can smell blood from a quarter of a mile away
D．it can only see up to fifty feet

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单项选择题

Why does the shark never stop moving

A．It never sleeps.
B．It can only smell when moving.
C．If stopped it would sink.
D．It must eat constantly.

单项选择题

What happened after the man asked if he could smoke

A．Alison offended him by asking him not to.
B．He went ahead without waiting for an answer.
C．He began to smoke but then put the cigarette out.
D．He took out his cigarettes but did to light on