A.loosenB.weakenC.decreaseD.reduce
A. loosen
B. weaken
C. decrease
D. reduce
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A.ThusB.ButC.ThereforeD.Then
A. Thus
But
C. Therefore
D. Then
A.tooB.lessC.notD.more
A. too
B. less
C. not
D. more
【C18】
A. encounter
B. confront
C. tolerate
D. expose
【C20】
A. which
B. what
C. as
D. that