《尚书》说：“为山九仞，功亏一篑。”意思是堆九仞高的山，只差一筐土而不能完成。青

难船为直升机显示吊运区位置的标注是（）

A、白色E

B、白色H

C、白色F

阅读下列材料：

材料一：

材料二（见下图）

请回答：

（1）根据材料一判断：这是中国近代史上的哪次著名变法？领导这次变法的领袖人物是哪两位？

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（2）根据材料二判断：甘为这次变法流血牺牲的杰出人物是谁？

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（3）根据材料一中新法的内容分析这次变法的历史意义。

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Scientists in Colombia have trained a team of rats to help remove land mines from the countryside. Land mines are small bombs hidden in the ground and designed to explode(爆炸) when someone steps on them.

When trained, the rats can smell special metals in the mines and then signal(发信号) to their human team. Then why use rats for such an important job?

In the past, dogs have been used to find bombs. Rats have a good sense of smell and can respond to orders, just like dogs do. But rats are much lighter than dogs. They stand less of a chance of setting off the mines, which explode under a certain amount of weight. What’s more, the best rats are cheaper to keep than dogs. It costs about the same amount of money to take care of one dog as it does 70 rats.

The rats have already been used in Tanzania, an African country with many land mines. Luisa Fernanda Méndez and her team in Colombia are training the even lighter Wistar rats. These are the white rats with red eyes that scientists often use in laboratory experiments. “They even train their babies to perform their jobs, which saves us a lot of time, ” Méndez said.

Colombia has the second-highest rate(比率) of deaths from land mine accidents in the world. Last year, land mines killed 695 people — 56 of whom were children. A criminal group called the Revolutionary Armed Forces of Colombia, or FARC, as well as other organizations, have placed the mines. FARC are strongly against Colombia’s government. The group has placed mines all around its own bases and in many places in the countryside.

In the past, the Colombian government hired peasants and poor farmers to find mines. Many of them died trying to find the well-hidden bombs.

Colombian police official Erick Guzmán hopes the team of rats can come to the rescue(援救). “These rats will be a great help,” he said.

小题1:How do rats help to find land mines?

A．By their special sight.

B．By their light weight.

C．By their sense of smell.

D．By their excellent hearing.小题2:The advantage of rats over dogs in finding bombs is that _____.

A．they are cleverer.

B．they run faster

C．they have a better sense of smell

D．they don’t make mines explode as easily小题3:The underlined word “They” may refer to ______.

A．scientists

B．Wistar rats

C．dogs

D．Méndez and her team小题4: What is the passage mainly about?

A．Specially-trained rats help clear land mines.

B．People in Tanzania are suffering from land mines.

C．Dogs are no longer used to find land mines.

D．Land mines have become a great danger to Colombians.

有关突变的错误说法是（）

A.点突变包括转换和颠换

B.插入2个bp可引起移码突变

C.突变可引起基因型改变

D.有突变发生则一定有表现型的改变

E.缺失一个bp则引起移码突变

项目风险管理采用分级管理，风险等级分为哪几级？