单项选择题

From the passage we learn that among the following four groups of people _______.

A．fat women are over eighty percent water
B．thin men are never eighty percent water
C．new-born infants are over eighty percent water
D．elderly adults are over eighty percent water

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单项选择题

Concerning the drug quinine, which of the following is NOT true

A．Originally, quinine was made from some tree bark.
B．Quinine is used to cure malaria.
C．Now, the cinchona tree is no longer the only source of quinine.
D．It was the Spanish people who first used quinine as a medicine.

单项选择题

Why do thin people usually feel better in hot days than fat people

A．Thin people perspire less.
B．Fat people do not sweat as much as thin people do.
C．Thin people have less heat inside their bodies.
D．Fat people have more fat cells which keep the heat inside.