题目

B 解析:∵P(X<-1)= P(X>1),则P(X>-1)= 1-p  . 答案:   . 解析:由已知得,正三棱锥的底面边长为1,正三棱锥的高为, 正三棱锥的俯视图是一个等边三角形,其底边长为1,高为,故侧视图的面积为S=.1.埃里克晚饭总是吃得很好。Eric always has ________________.2.运动有益于健康。Doing sports ________________ the health.3.珍妮每天吃大量的水果。Jenny has ________________ fruit every day.4.我弟弟太小了,他不会自己穿衣服。My brother is too young. He can’t ________________ himself.5.明天要么我要么他去开会。________________ going to the meeting tomorrow.
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