单项选择题

Which of the following expresses the main idea（）

A．Advertising molds public opinion.
B．The American public lacks taste.
C．The Federal Government should control advertisers.
D．Advertising increases the cost of living.

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单项选择题

According to the passage, magnesium was first obtained from （）

A．rocks found on land
B．great amounts of ocean water
C．the sea floor
D．major industrial sites

单项选择题

According to the passage, which of the following was a direct consequence of the new method of obtaining magnesium（）

A．The development of insulation materials.
B．Increased airplane production.
C．Improved medical facilities.
D．The development of the cheap inks for printing.