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．Smoking.B．Disease.C．Poor food.D．Accident.
A．Smoking.
B．Disease.
C．Poor food.
D．Accident.
单项选择题
A．By asking the waiter for advice.B．By asking the speaker for advice.C．By pointing at some pictures in the menu.D．By pointing at the speaker’s food.
A．By asking the waiter for advice.
B．By asking the speaker for advice.
C．By pointing at some pictures in the menu.
D．By pointing at the speaker’s food.
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