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]

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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

单项选择题

It becomes clear from the text that the driving force(动力)behind green products is ______.

A．public caring for the environment
B．companies' desire for bigger sales
C．new ways of doing business
D．rapid growth of supermarkets