规划编制部门向规划批准机关提交规划草案时应当报送规划编制说明、( )以及法律、行政

积极发展水路运输，改善出海口航道，提高内河通航条件，建设( )高等级航道网。

A．长江黄金水道

B．黄河—长江—大运河南北水运网

C．长江三角洲

D．松花江流域

E．珠江三角洲

阅读理解。

     It is easy for us to tell our friends from our enemies. But can other animals do the same? Elephants

can! They can use their sense of vision and smell to tell the difference between people who pose a threat

and those who do not.

     In Kenya, researchers found that elephants react differently to clothing worn by men of the Maasai

and Kamba ethnic groups. Young Maasai men spear animals and thus pose a threat to elephants;

Kamba men are mainly farmers and are not a danger to elephants.

     In an experiment conducted by animal scientists, elephants were first presented with clean clothing or

clothing that had been worn for five days by either a Maasai or a Kamba man. When the elephants

detected the smell of clothing worn by a Maasai man, they moved away from the smell faster and took

longer to relax than when they detected the smells of either clothing worn by Kamba men or clothing that

had not been worn at all.

     Garment color also plays a role, though in a different way. In the same study, when the elephants saw

red clothing not worn before, they reacted angrily, as red is typically worn by Maasai men. Rather than

running away as they did with the smell, the elephants acted aggressively toward the red clothing.

     The researchers believe that the elephants' emotional reactions are due to their different interpretations of the smells and the sights. Smelling a potential danger means that a threat is nearby and the best thing to

do is run away and hide. Seeing a potential threat without its smell means that risk is low. Therefore,

instead of showing fear and running away, the elephants express their anger and become aggressive.

1. According to the passage, which of the following statements is true about Kamba and Maasai people?

A. Maasai people are a threat to elephants.  

B. Kamba people raise elephants for farming.

C. Both Kamba and Maasai people are elephant hunters.

D. Both Kamba and Maasai people traditionally wear red clothing.

2. How did the elephants react to smell in the study?

A. They attacked a man with the smell of new clothing.

B. They needed time to relax when smelling something unfamiliar.

C. They became anxious when they smelled Kamba-scented clothing.

D. They were frightened and ran away when they smelled their enemies.

3. What is the main idea of this passage?

A. Elephants use sight and smell to detect danger.

B. Elephants attack people who wear red clothing.

C. Scientists are now able to control elephants' emotions.  

D. Some Kenyan tribes understand elephants' emotions very well.

我军装备的57自行高炮有效斜距离多少米？

（）气体灭火系统应设自动控制、手动控制和机械应急操作三种启动方式。

A、管网

B、无管网

C、全淹没

D、局部应用