设A、B两个随机事件，且BA，则下列各式子中正确的是(65)。
A. P(B|A)=P(B)
B. P(B-A)=P(B)-P(A)
C. P(A∪B)=P(A)
D. P(AB)=p(A)
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“吾貌虽瘦，天下必肥”这句话个中的真善美的确意味深长。下列表现真善美内涵的一项是______。
A. 自我约束、自觉奉献、言简意赅
B. 衣带渐宽、从我做起、浩然正气
C. 廉洁奉公、不计名利、以身殉职
D. 心甘情愿、引为骄傲、高尚境界
出口食品卫生注册证书的有效期为3年。()
A. 正确
B. 错误
In the passage how many cancers are mentioned in relation to smoking cigars daily？
A. Six.
B. Seven.
C. Eight.
D. Nine.
Children have more colds because
A. they are usually infected about eight times each year.
B. they are not immune to many cold viruses yet.
C. they never wash their hands so that their thumbnails are dirty.
D. they don't like eating lemon.
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