目前国内外公认治疗急性单核细胞性白血病的标准诱导方案，最常用的药物为（） A.柔红霉

已知方程x²+y²+x-6y+m=0，

（1）若此方程表示的曲线是圆C，求m的取值范围；

（2）若（1）中的圆C与直线x+2y-3=0相交于P，Q两点，且OP⊥OQ（O为原点），求圆C的方程；  

（3）在（2）的条件下，过点（-2，4）作直线与圆C交于M，N两点，若|MN|=4，求直线MN的方程．

（）此类告警是“全球眼”系统本身具备的功能，无需外接告警设备。

A.解红外探测告警

B.门磁探测告警

C.烟雾探测告警

D.移动侦测告警

阅读理解。

     Northern Europeans spend a lot of time in their cold and cloudy winters planning their summer holidays.

They are proud of their healthy color when they return home after the holiday. But they also know that a

certain amount of sunshine is good for their bodies and general health.

     In ancient Greece people knew about the curing powers of the sun, but this knowledge was lost. At the

end of the nineteenth century a Danish doctor, Niels Finsen, began to study the effect of sunlight on certain

diseases, especially diseases of the skin. He was interested not only in natural sunlight but also in man-made

produced rays. Sunlight began to play a more important part in curing sick people.

     A Swiss doctor, Auguste Rollier, made full use of the sun in his hospital at Leysin. Leysin is a small village

high up in the Alps. The position is important, the rays of the sun with the greatest healing power are the

infra-red (红外线的) and ultraviolet (紫外线的) rays; but ultra-violet rays are too easily lost in fog and the

polluted air near industrial towns. Dr. Rollier found that sunlight, fresh air and good food cure a great many

diseases. He was particularly successful in curing certain forms of tuberculosis(结核病) with his"sun-cure".

     There were a large number of children in Dr. Rollier's hospital. He decided to start a school where sick

children could be cured and at the same time continue to learn. It was not long before his school was full.

     In winter, wearing only shorts, socks and boots, the children put on their skis after breakfast and left the

hospital. They carried small desks and chairs as well as their school books. Their teacher led them over the

snow until they reached a slope (斜坡)which faced the sun and was free from cold winds. There they set out

their desks and chairs, and school began.

     Although they wore hardly any clothes, Rollier's pupils were very seldom cold. That was because their

bodies were full of energy which they got from the sun. But the doctor knew that sunshine can also be

dangerous. If, for example, tuberculosis is attacking the lungs, unwise sunbathing may do great harm.

     Today there is not just one school in the sun. There are several in Switzerland, and since Switzerland is

not the only country which has the right conditions, there are similar schools in other places.

1. According to the passage, when did people began to realize sunlight played a more important part in

    the treatment of disease?

A. From ancient times.

B. At the end of the nineteenth century.

C. Not until this century.

D. Only very recently.

2. Why are a Danish doctor and a Swiss doctor mentioned in the second and third paragraphs? 

A. Because they both made use of sunlight to treat illness.

B. Because they were the first people who used sunlight for treatment.

C. Because they were both famous European doctors.

D. Because they used sunlight in very different ways.

3. Dr Rollier set up a "sun-cure" school probably for the reason that _____.

A. most children could stay in his hospital

B. children could study while being treated

C. the school was expected to be full of pupils

D. the school was high up in the mountains

4. What can be inferred from the last paragraph of the passage?

A. "Sun-cure" schools are becoming popular everywhere.

B. Switzerland is the only country where "sun-cure" schools are popular.

C. Proper Conditions are necessary for the running of a"sun-cure" school.

D. "Sun-cure" schools are found in countries

下列选项中，（）属于《劳动合同法》中用工单位在使用劳务派遣时应当履行的义务。

A、执行国家劳动标准，提供相应劳动保护和劳动条件

B、为被派遣劳动者购买额外商业保险

C、连续用工的，实行正常的工资调整机制

D、告知被派遣劳动者的工作要求和劳动报酬

中国人口的分布呈现东北密、西南疏，以汉族为主体的大杂居、小聚居、交错居住的格局。 ( )