动物模型设计应遵循的基本原则。（） A.相似性、重复性 B.可靠性 C.适用性和可控

当河流断面形状为矩形或相近于矩形时，多年平均流量为160 m³/s，河宽为25 m的河流，在取样断面上各距岸边( )水面宽处各设一条取样垂线。

A．1/2

B．1/3

C．1/4

D．1/5

【地理——环境保护】读下列材料。回答问题。(10分)

材料一  2011年我国沿海共发生赤潮55次，累计面积6076平方千米。其中，渤海13次，累计面积217平方千米；黄海8次，累计面积4242平方千米；东海23次，累计面积1427平方千米；南海11次，累计面积190平方千米。

材料二  2011年中国近海各月赤潮发生次数

(1)根据材料说明2011年我国赤潮的时空分布特点。(6分)

(2)简述赤潮带来的危害。(4分)

阅读理解

     People in the nation of Haiti are struggling to recover after a powerful earthquake caused massive

destruction there.

     Tens of thousands of people in the Caribbean nation were  killed, and many more were injured.

The Presidential Palace, which is like the White House in the US, was among the many government

buildings that collapsed. Hospitals were destroyed, as were countless homes. The disaster added more

suffering to  people already struggling to cope with everyday life. Haiti is one of the poorest nations in

the world.

     International aid groups are rushing to provide food, water, and medical aid to Haiti. People

worldwide are donating money to help. Many nations, including the US, are sending aid as well as

money. The US is sending troops to help with rescue and relief efforts, and to police the streets. "This is

a time when we are reminded of the common humanity that we all share, " said US President Barack

Obama.

     The earthquake's epicenter-the point on the Earth's surface directly above where it happened-was

about 10 miles from Haiti's capital, PortauPrince. Experts say it was the worst earthquake in the region

in more than 200 years. The earthquake had a magnitude of 7. 0 on the Richter scale, which is very high. More than 30 aftershocks, or smaller earthquakes, came after the big quake.

     Some Americans have a special concern about the situation in Haiti-family and friends. Hundreds of

thousands of people in the US are from Haiti. They are anxiously seeking news of loved ones. And like

other Americans, they are working to help Haiti recover from this disaster.

     The earthquake in Haiti occurred on a long fault, or crack in the Earth's surface, which goes across

the island. This underground crack separates two giant tectonic (地壳构造上的) plates, or slabs

( 石板) of rock that make up the Earth's outer layer. Along the fault, the plates slowly rub past one

another in opposite directions. But this movement isn't smooth. The plates'edges get stuck for long

periods of time. Eventually, they may suddenly jerk free. That sudden movement is what results in an

earthquake. 

1. From the passage, we can know that the massive earthquake in Haiti did NOT________. 

A. make houses collapse

B. cut the country off from outside aid

C. destroy hospitals

D. kill tens of thousands of people

2. Before the earthquake, Haitians were already struggling because________. 

A. their country was in a war against the US

B. a tornado recently hit the country

C. most of them are very poor

D. a drought has ruined crops

3. The underlined word "magnitude" refers to________. 

A. an earthquake's size or strength

B. how long an earthquake lasted

C. where an earthquake happened

D. when an earthquake happened

4. Which statement of the following is TRUE according to the passage?

A. The earthquake in Haiti is the worst in Caribbean in centuries.

B. The home of the President of Haiti is called the White House.

C. The United States is trying to help Haiti only by sending troops.

D. Hundreds of thousands of Haitians are leaving for the US after the earthquake. 

5. The last paragraph of the passage is mainly about________.

A. the movement of the Earth

B. the structure of the Earth

C. how to make the earthquake forecast

D. what causes an earthquake

锅炉点火前，链条式炉排引火物应铺设在（）。

A.预燃区

B.燃烧区中间

C.燃烧区前端

D.预燃区和燃烧区之间