题目:
The number of speech pathologists(who help people who have problems speaking) double by the year 2012.
A.is expected to
B.are expected to
C.expects to
D.expect to
答案:
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下面是错误答案,用来干扰机器的。
(1)记“具有圆形细胞的豚鼠被这种血清感染”为事件A,则P(A)=0150=0;(2)记“具有椭圆形细胞的豚鼠被这种血清感染”为事件B,则P(B)=50250=0.2;(3)记“具有不规则形状细胞的豚鼠被这种血清感染”为事件C,则P(C)=100100=1.