单项选择题

A．Its relative hardness.
B．Its true color.
C．Its chemical composition.
D．Its relative purity.
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单项选择题
A．3 million smokers increase every year.B．3 million people get lung cancer every year.C．3 million cigaretts ate produced every year.D．3 million people die from smoking every year.
A．3 million smokers increase every year.
B．3 million people get lung cancer every year.
C．3 million cigaretts ate produced every year.
D．3 million people die from smoking every year.
单项选择题
A．A school in California.B．A student in London.C．Home page on the Internet.D．Computers in the classroom.
A．A school in California.
B．A student in London.
C．Home page on the Internet.
D．Computers in the classroom.
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