题目内容

某随机事件最多只有X、Y、Z三种互不相同的结果,关于X、Y、Z发生的概率,以下有可能的是________。

A. P(X)=1,P(Y)=-1,P(Z)=1
B. P(X)=0.3,P(Y)=0.2,P(Z)=0.5
C. P(X)=P(Y)=P(Z)=1
D. P(X)＞0,P(Y)=-P(X),P(Z)=1

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第二节完型填空
阅读下面短文，从短文后所给各题的四个选项(A、B、C和D)中选出能填入相应空白处的最佳选项。
Are you short？ Tall？ Do you like beef but hate pork？ Whatever your 【B1】 are, there is a club, society, or group 【B2】 you.
America is 【B3】 to about 25,000 clubs, associations, societies, and other groups 【B4】 all sorts of people join. If you are 【B5】 short, there are the "Short Stature Foundation" and "Little People of America". If you are tall, there are 【B6】 of clubs for all tall people.
If you can't stand pork, there's the "I Hate Pork" club; members get the No Pork newsletter, and a 【B7】 of pork-free restaurants.
Many people claim to 【B8】 the rock star Elvis Presley, 【B9】 his death in 1977. Maybe that's because so many people dress 【B10】 and act like Elvis. Some of them formed the "Elvis Presley Impersonators Association International".
If you like to sing along 【B11】 a microphone as you listen to music, you 【B12】 consider the "Karaoke International Sing-Along Association".
The "International Organization of Nerds" has more than 10,000 members. It is 【B13】 by a man in Cincinnati, Ohio, who calls himself the Supreme Archnerd. He says 【B14】 may be for you if your eyeglasses are held together with tape, you keep 【B15】 thirty seven ball-point pens in a plastic pocket protector, and you 【B16】 slacks and shirts of clashing plaids.
Many clubs are devoted to food. The "International Banana Club." wants people everywhere to smile more in 【B17】 world that is going bananas. The "International Apple Association" is devoted to 【B18】 giant apples. "Slow Food Foundation" is a club that objects to fast-food places and promotes the joy of 【B19】 dining.
Because so many people love animals, there are many clubs to protect 【B20】 creatures. For instance, "Bat Conservation International" wants people to know about the many good points of bats.
【B1】

A. hobbies
B. activities
C. interests
D. attitudes