题目

在1,3,4,5,8路公共汽车都要停靠的一个站(假定这个站一次只能停靠一辆汽车),有一位乘客等候4路或8路汽车.假定当时各路汽车首先到站的可能性相等,则首先到站正好是这位乘客所需乘的汽车的概率等于( )A.     B.     C.     D. 答案：【答案】D【解析】由题意知，在该问题中基本事件总数为5，这位乘客等候的汽车首先到站这个事件包含的基本事件个数为2，故所求概率为。选D。根据汉语提示填写单词。1. The music ________(听起来) like birds singing.2. If you get a ________(机会) to go there, please take it.3. The little boy was _______(惊讶) at the beautiful fish he could see in the sea.4. The sign here ________(警告) you not to smoke.5. It' s not ________(允许) to take the books out of the classroom.6. The story happened a few ________(世纪) ago.7. These days the workers are busy ________(生产) this kind of medicine.8. His parents always ________(鼓励) him to study hard.9. Tom is very ________(自豪) of his new car.10. His son is living ________(国外) now.