单项选择题

Smith has repaired the roof to ______ the house is wind-resistant.

A．improve
B．prove
C．insure
D．ensure
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单项选择题
When Columbus landed in the New World, he believed he had found a new ______ to Asia.
A．trail
B．path
C．track
D．route
单项选择题
______ deserts are dry regions, visitors might come upon an area with trees and water.
A．Just because
B．Only when
C．As if
D．Even though
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