单项选择题

He often attends public lectures at the university of California chiefly ______ his English.

A．to improve
B．as to improve
C．to import
D．expect for
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单项选择题
According to the passage, if one wants to predict the way (consumers will spend their money, he should ______.
A．rely on traditional assumptions about earning and spending
B．try to encourage or discourage consumers to spend money
C．carry out investigations on consumer behavior and obtain data on consumers’ incomes and money spending motives
D．do researches in consumer psychology in a laboratory
单项选择题
They decided to chase the cow away ______ it did more damage.
A．unless
B．until
C．before
D．although
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