一个不透明的布袋中有分别标着数字1，2，3，4的四个乒乓球，现从

搜题请搜索小程序“爱下问搜题”

问题选择题

一个不透明的布袋中有分别标着数字1，2，3，4的四个乒乓球，现从袋中随机摸出两个乒乓球，则这两个乒乓球上的数字之和大于5的概率为（　　）

A．

B．

C．

D．

答案

列表得：

	1	2	3	4
1	-	2+1=3	3+1=4	4+1=5
2	1+2=3	-	3+2=5	4+2=6
3	1+3=4	2+3=5	-	4+3=7
4	1+4=5	2+4=6	3+4=7	-

∵共有12种等可能的结果，这两个乒乓球上的数字之和大于5的有4种情况，

∴这两个乒乓球上的数字之和大于5的概率为：

．

故选B．

写作题

有两名国际交流生想加人你们学校的英语俱乐部。请你根据下面的日程表，用英语给他们介绍俱乐部每周的活动安排。
☆☆学校英语俱乐部活动日程表

日期	活动内容	时间	地点
星期一	学唱英文歌曲	下午4:00-5:00	302教室
星期三	英文电影欣赏	晚上7:30-9:00	学校图书馆2楼
星期五	英语会话、开放式英语角	下午3:30-4:30	学校风雨(indoor)操场

注意：1.词数80左右；
2.可以适当增加细节，但文中不能出现学校的真名；
3.开头已给出，不计人总词数。
Hello! Welcome to join in our English club. Let me tell you the calendar of our school English club.

查看答案

单项选择题

There are two factors which determine an individual’s intelligence. The first is the sort of brain he is born with. Human brains differ considerably, some being more capable than others. But no matter how good a brain he has to begin with, an individual will have a low order of intelligence unless he has opportunities to learn. So the second factor is what happens to the individual—the sort of environment in which he is reared. If an individual is handicapped environmentally, it is likely that his brain will fail to develop and he will never attain the level of intelligence of which he is capable.

The importance of environment in determining an individual’s intelligence can be demonstrated by the case of the identical twins, Peter and Mark Being identical, the twins had identical brains at birth, and their growth processes were the same. When the twins were three months old, their parents died, and they were placed in separate foster homes. Peter was reared by parents of low intelligence in an isolated community with poor educational opportunities. Mark was reared in the home of well to do parents who had been to college. He was read to as a child, sent to good schools, and given every opportunity to be stimulated intellectually. This environmental difference continued until the twins were in their late teens, when they were given tests to measure their intelligence. Mark’s IQ was 125, twenty five points higher than the average and fully forty points higher than his identical brother. Given equal opportunities, the twins, having identical brains, would have tested at roughly the same level.

According to the passage, the average IQ is （）.

A．85

B．100

C．110

D．125

查看答案