单项选择题

A．Its population consists of people of various nationalities.
B．The people tend to gather in racial groups.
C．It has always kept its door open to immigrants.
D．People all over the world have been to the country.
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单项选择题
The “over-the-counter drugs” are those that _______.
A．patients can get without doctors' prescriptions
B．can relieve the symptoms of a disease
C．attack the organism that causes a disease
D．tend to be complex and powerful synthetic drugs
单项选择题
What is the main idea of this passage
A．The development of modern drugs.
B．How to make drugs.
C．How to use drugs safely.
D．The development of drugs.
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