北京中关村是经国务院批准的我国第（）家高科技园区。A、三 B、二 C、四 D、一

头发稀疏易落，舌红脉数，多见于

A．胀痛，与精神因素有关，伴胁胀，善太息，脉弦
B．喇痛，伴舌暗，有青紫色瘀斑瘀点，脉细涩或结代
C．闷痛，多见体胖痰多，身重困倦，苔白腻，脉沉滑或沉涩
D．痛势剧烈，突然发作，得温痛减，伴畏寒喜暖，肢冷，舌淡苔白，脉沉迟或沉紧
E．头痛、头晕，失眠，健忘，舌质紫暗，脉细涩

下列关于空气的说法中，不正确的是（　　）

A．空气是一种十分重要的天然资源

B．空气能将所有的有害物质进行自我净化而除去

C．工业上用分离液态空气制氧气的过程属于物理变化

D．按体积分数计，空气中约含有氮气78%、氧气21%、其他气体和杂质1%

阅读理解。

     If you dream of going someplace warm to escape the cold winter weather, a trip to a recently discovered

planet would certainly warm you right up, The planet, named OCLE-TR-56b, has temperatures of more than

3,000 °F. "This is the hottest planet we know about," says Dr. Dimitar Sasselov, a scientist who led the

discovery team, "It is hot enough to have an iron fog and to rain hot iron droplets (细沫)"

     The new planet is 30 times farther away than any planet discovered by scientists before. It is in the Milky

Way (银河) but it is not in our solar (太阳的) system The new planet moves around a star much like our sun,

however. Seientists discovered the planet by using a new planet-searching method, called "transit technique"

They were able to catch sight of the planet when it moved in front of its star, causing the star's light to dim

(变暗). Scientists compare the method to discovering the shadow of a bee flying in front of a searchlight 200

miles away. "We believe the door has heen opened wide to go and discover planets like Earth," says Sasedlov.

1. We can infer from the passage that _____.

A. there is iron on the new planet

B. we could go to the new planet in winter

C. the star could block our view of the new planet

D. scientists are studying the weather on the new planet

2. The "transit technique" can _____. 

A. help dim the light of a star.

B. help scientists with a searchlight

C. help discover a bee on a planet

D. help find a planet moving before its star

3. Which is the best title for the passage?

A. New Planet-searching Technique

B. New Distant Discovery

C. Space Searching

D. Dream Planet

金属材料的布氏硬度单位常用（）来表示。

A.kg·m

B.kg·mm

C.kgf/mm²

D.kg/m²

基本的门电路有哪三种？门电路的输入和输出是哪两种状态？