单项选择题

A．point
B．lead
C．come
D．amount
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单项选择题
______ progress has been made in cutting down the mortality rate in China.
A．Rapid
B．Slow
C．Little
D．Negative
单项选择题
Why are sharks useful for humans
A．For their tasty meat.
B．For the principle of their defense system against disease.
C．For their solid skin.
D．For the principle of their birth modes.
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