单项选择题

A．Nutrition.
B．Ecology.
C．Medicine.
D．Geology.
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单项选择题
A．She’s on a special diet.B．She doesn’t like to eat in the canteen.C．She thinks the canteen is too expensive.D．She had no money with her.
A．She’s on a special diet.
B．She doesn’t like to eat in the canteen.
C．She thinks the canteen is too expensive.
D．She had no money with her.
单项选择题
A．Increase the sample number.B．Extend the time of the study.C．Observe the sample group of vegetarians.D．Both A and B.
A．Increase the sample number.
B．Extend the time of the study.
C．Observe the sample group of vegetarians.
D．Both A and B.
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