，A发生B不发生的概率与B发生A不发生的概率相同，则事件A发生的概率P(A)是 .
的概率分布如下，且E(
确定，i=1，2，3，则C的值为
.
70. “He is a little noisy, but o_______ he is a good boy,” said the mother.
第五节： 短文改错 (每题1分，共10分)
David joined the army when he was eighteen. And for
several months he taught how to be a good soldier. 71_______
He did quite good in everything except shooting. One day he 72_______
and his friends are practising their shooting, and all of 73______
them did well besides David. At last the officer said, “David! 74_______
You are quite hopeless! Do not waste your bullets. 75_______
Go behind the wall, and shoot you.” David felt ashamed. He 76_______
went behind the wall and a few seconds late the officer 77_______
and the others young soldiers heard a sound of a shot 78______
“Heavens!” the officer said, “has that silly man really shooted 79______
himself?” He ran behind the wall anxious. But David was all 80______
right. “I am sorry, sir,” he said “But I missed again.
第六节 书面表达(满分15分)
我国正提倡建设“节约型社会”，下图为某校两个学期用水、用电、用纸的情况。请对其进行简要分析，以 “How to build an economized society”为题，写一篇作文，谈谈自己的想法。
 |
用 电 |
用 水 |
用 纸 |
|
上学期 |
80万元 |
62万元 |
11万元 |
|
下学期 |
95万元 |
73万元 |
12.7万元 |
文章须包括以下要点：
节电：及时关闭电灯、电脑等用电设备
节水：随手关闭水龙头；废水利用
节纸：纸张再利用
补充：自己日常生活所感所为
注意：
词数：100-120字，短文标题，开头已给出，但不计入总词数。
内容可适当发挥，注意行文贯通。
How to build an economized society
Our government is aiming to build an economized society. It is everybody’s duty to work hard to achieve this goal including us students.