单项选择题

The social security system is designed to ______ a basic standard of living for people in financial need.

A．secure
B．keep
C．preserve
D．maintain
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单项选择题
There will be great demand on your efforts before you reach the ______ of the race.
A．dead line
B．end line
C．finish line
D．finishing line
单项选择题
Because of the economic slump, there are only ______ on the beach as before.
A．one-fifth tourists as many
B．one-fifth as many tourists
C．tourists one-fifth as many
D．tourists as one-fifth many
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