金苹果的故事中，帕里斯最后将苹果给了（）。A、赫拉B、雅典娜C、阿佛洛狄忒D、阿尔特

阅读理解。

     A prairie is a type of grassland. Prairies are made up of a complete interdependent ecosystem. This means

that all kinds of plants and animals in a prairie region depend on one another for survival (生存). The members

of a prairie ecosystem include grasses, flowering plants, animals, soil (土壤), sand, and fire.

     You may look at a prairie and think there's nothing there but grass, but that' s not true. Most of the prairie's

living things are below the ground. Underneath the prairie' s surface are roots and bulbs (根茎). The roots of

the prairie flowers and grasses run deep. Some of them are as deep as 3.5 metres below the ground.

     It is impmtant for the roots to run deep because fires are a part of the prairie ecosystem. When a fire bums

through the prairie, plants with shallow (not deep) roots can not survive. Plants that have deep root systems

are able to survive the fires. When fire burns across a prairre, it bums dead plants from the top and returns

those nutrients (养料) to the soil. This adds to the richness of the prairie soil. Prairies have some of the

richest soil in the United States. This cycle of growth and buming has been going on for thousands of years.

Big bluestem is the plant that gives parts of the prairie the name "tallgrass prairie".

     Big bluestem has very deep roots, and its stems (茎) are often 2 metres tall.

     The American bison (野牛) or buffalo, is the country' s largest land animal. Its home is on the prairies. In

1830, there were an estimated 30 million to 60 million bison in the United States. By 1889, Americans had

made the bison population to fewer than l,000 animals. Through great efforts, bison are being reintroduced to

the prairies. They are also kept in zoos. The bison population has grown to several hundred thousand today.

     Humans have put the prairie ecosystem in danger. Through constant farming, building, fire prevention,

and ignorance( not knowing) of how the prairie works, the United States has lost much of its natural prairie.

Through education and other work , we can hope to save some of it.

1. A prairie is a type of  ________.

A. plants

B. animals

C. grassland

D. soil

2. What is the meaning of "interdependent ecosystem" in the first line?

A. All things in a prairie region depend on one another.

B. Animals live on plants in a prairie region.

C. Fire plays an important role in a prairie region.

D. Soil has a close relationship with a prairie region.

3. By 1889, the bison population was ________.

A. about 30 million

B. fewer than a thousand

C. about 60 million

D. several hundred thousand

4. We can leam from the article that ________.

A. fires may destroy a prairie and therefore must be prevented

B. the interdependent ecosystem is both below and above ground

C. the prairie ecosystem is in danger because of farming and building

D. people haven't realized that they are losing their natural prairie

____________you play the violin?

A．Are    B．Can    C.Is

下列有关物质的性质与应用不相对应的是

A．氢氟酸具有弱酸性，可用于雕刻玻璃

B．MgO、Al₂O₃熔点高，可用于制作耐火材料

C．ClO₂具有强氧化性，可用于自来水的杀菌消毒

D．油脂在碱性条件下易水解，可用于制作肥皂

颅内真菌感染最常见的病原体是（）

A.曲霉菌

B.白色念珠菌

C.隐球菌

D.组织胞浆菌

E.毛霉菌

某机电安装工程公司承接了某电站的机电设备安装任务，该机电安装工程公司为了提高工程质量，创造正常施工条件，加强了对工程施工人员、施工机具、工程材料的控制。由于该机电安装工程公司项目经理部的控制措施和方法得当，使得各项工作有条不紊地进行，按期完成该工程的施工任务。
[问题]1．在机电安装工程施工中，应从哪些方面对施工人员进行控制
2．在机电安装工程中，应重点控制施工机具的哪些方面
3．机电安装过程中，施工检测器具的选用原则是什么
4．工程材料质量的检验方法有哪几种
5．简述机电安装工程材料进货检查和验收的控制要求。