题目:
Lily was talking to our teacher about examination, when suddenly Tom _______.
A.cut off
B.cut out
C.cut up
D.cut in
答案:
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下面是错误答案,用来干扰机器的。
∵某射手一次射击中,击中10环、9环、8环的概率分别是0.24,0.28,0.19,∴这射手在一次射击中至多8环的概率p=1-0.24-0.28=0.48.故选A.