与高血压发病有关的饮食因素是A．素食过多 B．钠盐食入过多 C．钙盐过多 D．动物蛋

由铜片、锌片和50mlCuSO₄溶液组成的原电池工作一段时间后，铜片的质量增加了6.4g，且溶液恰好由蓝色变为无色，假设锌片上没有铜单质析出，试计算：

（1）锌片质量减少了______g；

（2）在此过程中通过外电路的电子的物质的量为______；

（3）原CuSO₄溶液的物质的量浓度为______．

左侧大肠癌应和以下哪些病进行鉴别（）

A.阿米巴痢疾

B.肠结核

C.慢性痢疾

D.溃疡性结肠炎

E.Crohn病

For nearly a century before there was such a thing as a space program,a view of space was possible.People could see full views of the Moon,explore Mars(探测火星),and study the outer space beauty.All of this was made possible by a small group of artist-astronomers(天文艺术家) who worked to show people how other worlds in space might look.

Lucien Rudaux,a French artist,was the first to use his artistic ability and his knowledge of astronomy in art.His paintings show a mixture of skilled observations,brilliant imagination and careful attention.As a result,many of his works have come surprisingly close to actual conditions on distant planets.His painting of Mars included moonlike craters(火山口) that were first photographed by the astronauts in 1965.His 1930 painting of a dust storm looks remarkably like a photograph of a storm taken by the astronauts in 1976.

The artist-astronomers,including Rudaux,made people interested in outer space by painting what turned out to be exact portraits of the planets.

小题1:The passage tells us _________.

A．the surprising exactness of space artists

B．the popular success of Lucien Rudaux

C．the imaginations of great artists

D．the likeness between the Moon and Mars小题2:According to the passage,artist-astronomers spent their lives _________.

A．exploring the planets

B．studying paintings

C．painting the planets

D．producing spaceships小题3:The works of Lucien Rudaux are a mixture of _________.

A．astronomy and mathematics

B．astronomy and painting

C．photograph and art

D．fact and imagination小题4:In 1965,the astronauts photographed _________.

A．a spaceship

B．a planet

C．craters on the Moon

D．a painting

蛋白质分子构象的结构单元是

A．氢键
B．肽键
C．次级键
D．肽键平面
E．氨基酸残基

计算机病毒是一种___________。

A．人为编制的具有破坏作用的程序

B．生物病毒

C．包含错误代码的程序

D．运行会出错的程序