单项选择题

According to an investigation, automobiles are ______ for two-thirds of the smog in American cities.

A．inferior
B．resistant
C．unconscious
D．responsible
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单项选择题
The President's absence from the dinner has ______ the speculation about his health.
A．held on to
B．given rise to
C．lived up to
D．stood up to
单项选择题
Children's intelligence, music ability, physical endurance, etc. ______ enormously from individual to individual.
A．vary
B．change
C．alter
D．shift
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