工程项目施工合同是发包人就完成具体工程项目的（）等工作内容，确定双方权利和义务的协议

（用公式法）2x²-x-1=0．

There _____________ two beds in my bedroom.[ ]

A. be

B. is

C. are

高位直肠肛门闭锁

A．肠套叠病程36小时，全身情况可
B．肠管坏死，极度危急时
C．口服碳片8小时后由肛门排出
D．果酱样血便
E．肠套叠病程56小时

阅读理解。

     There are varieties of bee in the world. Scientists are interested in honeybees because of the "language" they

use to communicate with each other. Karl von Frisch, a professor from Austria, devoted many years of his life

to researching the ways honey-bees communicate in their hives (蜂房). Karl von Frisch built special hives, a

glass wall and painted some honey-bees with different colors.

     A marked bee which returned to the hive from the feeding table performed a dance on the surface of the

honeycomb (蜂巢). First it made a circle to the right, then to the left. It repeated these circles again and again.

The surrounding bees copied its dances and then they left for the feeding place.

     Karl von Frisch set up two feeding places. One was close to the hive the other was farther away. The bees

that had been at the nearby feeding place were doing the circling dance. The bees at the distant feeding place

were dancing differently. The dancer ran in a straight line, wagging (摇摆) from side to side. Then it turned in

a semicircle (半圆), ran straight again, and turned in another semicircle to the opposite side. It repeated the

dance over and over. The dances convey messages about the far-away feeding place. Karl von Frisch and his

assistants slowly moved a feeding place close to the hive farther and farther away and they counted how many

times the bees repeated the dance in one minute. Finally they found out the number of wagging dances per

minute told the exact distance to the feeding place.

1. Scientists are interested in honeybees just because _____. [ ]

A. The honey-bees have bright colors.

B. The honey-bees enjoy a strange way of communication.

C. The honeydew is delicious.

D. there are several kinds of bees in the world.

2. Professor Karl von Frisch was from _____. [ ]

A. America

B. Australia

C. Sweden

D. Austria

3. What information does the dance convey? [ ]

A. There is no feeding place around.

B. The feeding place is farther away.

C. The feeding place is too far for the bees to get to.

D. The feeding place is near the hive.

4. What did Karl von Frisch want to find out while moving a feeding place close to the hive farther and farther

    away? [ ]

A. How the bees continued their dances.

B. How the bees communicated the distance to the feeding place.

C. The differences between the circling dance and the wagging dance.

D. How the bees flew to the feeding place.

特发性血小板减少性紫癜患者经泼尼松治疗1年后，血小板20×10⁹/L，但仍在维持服用泼尼松30mg/d。

如果将治疗前患者血浆输给正常人，受者血小板将会（）。

A.功能减低

B.数量减少

C.数量增多

D.数量不变

E.功能增强