单项选择题

Make sure that the（） of the gas pipes are sealed properly.

A. heels
B. joints
C. connections
D. enclosures

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单项选择题
One of the attractive features of the course was the way the practical work had been（）with the theoretical aspects of the subject.

A. embraced
B. adjusted
C. alternated
D. integrated
单项选择题
A comprehensive market system should be established to（）the flow of talent, funds and materials.

A. suffice
B. necessitate
C. facilitate
D. fabricate
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