3. After his journey from abroad, Richard Jones returned home, .
A exhausting B exhausted C being exhausted D having exhausted
2. It’s very dangerous to be ____ to the SARS virus without any protection.
A disclosed B uncover C affected D exposed
1. -I enjoyed the food very much.
-I’m glad you like it. Please drop in any time you like.
-________
A. Is it all right? B. I'm afraid I won't be free.
C. Yes, I will. D. That's great.
3.记“两球恰好颜色不同”为事件C则P(C)=
2.记“从中摸出一个球，放回后再摸出一个球，两球同时是黑球”为事件B则P(B)=
22. 解：1. 记“从中一次摸出两个球，两球恰好颜色不同”为事件A则P(A)=
21.解：因为该点在圆外设直线斜率为K则方程为y-4=k(x-2)即kx-y+4-2k=0所以解得K＝所以直线方程为：或
20.1解：记“点数之和为8”为事件A则P(A)=.
2记“点数之和大于10”为事件B则P(B)=
19.解：设所求圆的方程为：(x+3)2+y2－13+(x2+(y+3)2－37)＝0
因为圆心在x-y-4=0上，所以＝－7所以圆方程是：
3. 记“所选3人至少有1名女生”为事件C则其对立事件为A事件则P(C)=
解得K＝
所以直线方程为：
或
大于10”为事件B则P(B)=
(x2+(y+3)2－37)＝0
方程是：
