单项选择题

A．The number of smokers has been falling about 2 percent a year.
B．The number of smokers has been rising 20 percent a year.
C．The number of smokers has been rising 2 percent a year.
D．The number of smokers has been failing 20 percent a year.
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单项选择题
A．It makes a clone from an ordinary, adult cell.B．It makes the first normal and healthy cloned animal.C．It paves the way to the cloning of human beings.D．It makes a cloned animal with only mother.
A．It makes a clone from an ordinary, adult cell.
B．It makes the first normal and healthy cloned animal.
C．It paves the way to the cloning of human beings.
D．It makes a cloned animal with only mother.
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