宋代在行书方面取得重大成就的书法家有（） A.苏轼 B.黄庭坚 C.米芾 D.蔡邕

阅读理解。

        Scientist has told us so much about the moon that it's quite easy to tell what it would like to go

there. It's certainly not a friendly place. As there is no air or water, there can be no life of any kind.

Mile after mile there are only plains (平原) of dust (土) with mountains around them above, the sun

and the stars shine in a black sky. If you step out of the mountains shadows (阴影) it will mean moving

from terrible (非常) cold into great heat (热).      

       The moon is also a very silent (安静) world, for sound waves (波) can only travel through air.

But from the moon, you can see a friendly sight (景象). Our earth is shining more brightly than the

stars. It looks like a very large ball, coloured blue and green and brown.

1. What kind of place is the moon?

A. It is a friendly place.

B. It is a lively place.

C. It is a nice place for man to live

D. It is a lifeless place.

2. Temperature on the moon _______.

A. are usually the same

B. are always very low

C. can be very different 

D. are usually very high

3. The moon is a silent world because _______.

A. there is no life there

B. there is no air there

C. there is no green tree there

D. there is no water there.

4. When we look from the moon, the sky is _______.

A. blue

B. black

C. green

D. brown

5. "…there are only plains of dust with…", the word "dust" means _______.

A. ground

B. dry earth

C. land

D. field

关于紫癜型过敏性紫癜的临床表现，描述不正确的是

A．皮肤反复出现淤点，淤斑

B．血管壁可有壮性坏死及血小板血栓形成

C．可出现血性丘疹或小形荨麻疹

D．少数可有局限性血管性水肿

E．常有阵发性绞痛，可伴恶心、呕吐、腹泻、便血

医用中频电流的频率范围是

A．100～1000Hz
B．1000～2000Hz
C．1000～100000Hz
D．2000～100000Hz
E．2000～1000000Hz

操作系统是对( )进行管理的系统软件。

A．硬件
B．软件
C．计算机资源
D．应用程序

一般情况下．散热器出口处、凝结水干管始端、水平干管抬头登高的最低点、管道转弯的最低点等位置要设疏水器。( )