一般常见的沉积岩是由哪些矿物组成的？

2.6的一半是（   ）。

根据对话情景和内容，从对话后的选项中选出能入空白处的最佳选项。选项中有两项为多余选项。

Choosing to Study Overseas

Every year, thousands of students choose to study in another country for a semester, the summer, or a year. Studying overseas can be an exciting experience for many people.

    小题1:    

Living in another country can help you to learn a language, and about another culture.

 小题2:    .Overseas study may also look good on your future resume. Many companies today want employees who speak a second language, or have experienced living or working in another country.

Making the right choice

Once you decide to study overseas, you have to make some choices. To choose the right country or school. Ask yourself: Where do I want to go and why? How much do I want to pay?

  小题3:      Do I want to live with a host family, with roommates, or alone?

Getting ready to go

Get your passport and visa early!   小题4:     .Learn about the money. Bring some of it, and a credit card, with you.

Once you are there

After the first few weeks overseas, many students will feel a little homesick. They may miss their family, friends, and familiar ways of doing things.  小题5:     When you feel sad or homesick, try to talk to others, or write about your feelings in a notebook.

A．Before you go, learn some of the language, and read about some common customs in your host country.

B．Why do it?

C．large number of students can’t afford to study overseas.

D．How long do I want to study overseas?E. Remember that it takes time to get used to a new place, school, and culture.

F. You will see the world in a new way, and learn more about yourself.

G. You should improve your mother tongue before you go.

冬春季节，农民利用日光塑料大棚种植瓜果或蔬菜，既能增加产量，又可获得反季节果蔬，这是农民快速致富的有效途径．如何科学合理地控制大棚中植物生长的各种环境因素，使植物体内有机物的积累最大化是需要研究的重大课题．请根据所学知识，回答并解释有关问题：

（1）植物进行光合作用所需的原料是______，场所是______．

（2）为了增产，农民常向大棚内施放“气肥”，气肥主要通过______进入植物体内的．

（3）到了晚上，农民常把塑料大棚掀开一小角，使冷空气进入以降低室温，这样做的主要目的是______．

（4）到了晴朗的中午，气温较高时，农民常把上部的塑料薄膜全部掀开，使之通风．通风的直接作用是______．

遇有电气设备着火时，应该立即切断电源，然后救火。对带电设备应该使用的灭火器是（）。

A、干式灭火器；

B、二氧化碳灭火器；

C、泡沫灭火器；

D、1211灭火器。

房地产业是从事房地产（）的产业：

A、开发

B、经营

C、管理

D、服务