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
The author's tone in this passage is ______.
A．sympathetic
B．doubtful
C．critical
D．objective
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