单项选择题

What does this passage mainly discuss

A．The effectiveness and safety of aspirin.
B．The functions of aspirin.
C．The development and the effectiveness and side effects of aspirin.
D．The 20th century wonder drug -- aspirin.

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单项选择题

What has caused the pollution problem

A．Careless methods of production.
B．Lack of consumer demand for environment friendly products.
C．Millions of tons of glass, paper, plastic and metal containers are produced.
D．Both[A]

单项选择题

The underlined word it in the fourth paragraph refers to ______.

A．a selling point
B．the company name
C．a great demand for health foods
D．the manufacturing of green products