单项选择题

Living in the central Australian desert has its problems, （）obtaining water is not the least.

A. of which
B. for what
C. as
D. whose

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Because of difficulties in getting a visa, the students had to ______ the idea of applying for study in the United States.
A. reduce
B. yield
C. relinquish
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单项选择题
We are convinced that we are on the （）of an important discovery.

A. threshold
B. household
C. thread
D. entrance
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