单项选择题

It seems to the author that the medicine used by early people _______.

A．was of no real value
B．was probably effective
C．was easy to make
D．did more harm than good
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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.
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