单项选择题

In order to correctly acquire the meanings of nouns in referring to "classes", a child ______.

A．has to learn to identify some features while ignoring others
B．first has to be able to use proper nouns
C．must be at least six years old
D．must play with toys

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单项选择题

According to the passage, what will be the consequence if the present trend goes on

A．Political turmoil.
B．Excess taxes.
C．Low productivity.
D．Tight labor market.

单项选择题

Which of the following statements is NOT true

A．White-collar workers are also fired in large numbers.
B．Last year's U. S. economical growth was very impressive.
C．Companies with rising productivity used to raise wages to keep labor.
D．Self-employment was a way out for the American economy.