急诊处方用量一般不得超过（）。 A.1天 B.2天 C.3天 D.4天 E.5天

阅读理解。

     The history of the United States is a history of people on the move. The Native Americans came to

North America thousands of years ago. Some of them built villages and stayed there, but many moved from

place to place.   

     The first travelers from Europe came to live in an unknown land. At first, they stayed near the coast,

but then a few brave men went west, far into the country. Two of them were Meriwether Lewis and William

Clark. In 1804, they started on their long journey from St. Louis, Missouri, to the Pacific Ocean. They

followed the Missouri River west, went across the Rocky Mountains, and followed the Columbia River to the

Pacific. Then, they turned around, and traveled back to St. Louis.

     During the next 150 years, millions of poor people came from the old cities of Europe. They built the new

cities of US, and farmed the land. But they did not always stay in their new cities or on their farms. Many

people moved on, deeper and deeper into the new land. Some followed religious leaders (宗教领袖) like

Joseph Smith. He and his followers built Salt Lake City in Utah. Others went to look for gold. After the

California Gold Rush in 1849, San Francisco grew from a village to a city in only a few years.

     People are still moving to the US and finding new homes there. Up to one million people come into the

US from Mexico in one year. At the same time, many more arrive from the Pacific nations and regions-from

the Philippines, Korea, Vietnam, Taiwan and also from Central and South America. The history of the US is

still on the move.

1. Which of the following is NOT true about the first travelers from Europe?

A. They came to North America thousands of years ago.

B. They came to live in an unknown land.

C. They stayed near the coast.

D. A few brave men went west, far into the country.

2. During the next 150 years, millions of poor people did not ________.

A. come from the old cities of Europe

B. build the new cities of the US

C. always stay in their new cities or on their farms

D. farm the land

3. People from the following countries or regions except ________ are mentioned as still moving to the US.

A. Mexico

B. Pacific nations and regions

C. Central America

D. South Africa

4. Which picture shows the journey made by Meriwether Lewis and William Clark in 1804?

硝酸盐受热分解的产物与硝酸盐的组成以及受热的温度等因素有关。

Ⅰ．一定条件下硝酸铵受热分解的化学反应方程式为：NH₄NO₃→HNO₃+N₂ +H₂O（未配平）

（1）该反应中发生还原反应的过程是_______→________。

（2）反应中被氧化与被还原的氮原子数之比为__________；现有1mol NH₄NO₃分解，生成的氧化产物的物质的量是     mol。

Ⅱ．硝酸铵受撞击或高温发生爆炸的化学反应方程式为：m NH₄NO₃→n O₂+p N₂+q H₂O

（3）下列关于该方程式中化学计量数的说法正确的是_________（选填字母编号）。

a．m＝1             b．n＝2            c．p＝3            d．q＝4

（4）若反应过程中共转移3．01×10²³个电子，则反应可产生气体的体积为_____（标准状况）。

用水平方向的力F将重为G的木块压在竖直墙壁上静止不动，如图所示，当力F增大到2F时墙对木块的摩擦力

A、是原来的2倍

B、与原来的相等

C、是原来的3倍

D、是原来的1/2倍

地下水监测项目中，水温监测每年1次，可与（）水位监测同步进行。

A.平水期

B.丰水期

C.枯水期

长期、反复的室速可致心室扩大和心功能不全。（）