乳腺纤维瘤的好发年龄是（） A.18～25岁 B.20～25岁 C.40～60岁 D

女性，40岁，大便一天4～5次5年余，多于饭后，精神紧张时发生，便前多出现腹痛，便后缓解。大便为黄稀便或水便，无夜间腹泻，血便或消瘦。

你认为哪项检查对诊断帮助最大()

A．便常规及隐血

B．钡灌肠

C．结肠镜

D．直肠镜

E．便培养

In the long discussion of water on the Moon, a new study contradicts(与……相矛盾)) some recent reports that say the Moon had water at the time of its formation. A group of researchers reported in the journal Science that when the Moon was created, some 4.5 billion years ago, there was not much hydrogen(氢气) on it, and therefore no water.

The researchers surveyed and evaluated this by analyzing chlorine isotopes（氯同位素） found in lunar rock samples from Apollo missions. The range of chlorine isotopes in lunar samples was 25 times that found in samples from Earth.

If the Moon had significant levels of hydrogen, as Earth did, this range would have been far less, said Zachary D Sharp, a scientist in the Department of Earth and Planetary Sciences at the University of new Mexico and the study’s lead authour.

The chlorine would have stuck together with hydrogen, forming compounds like hydrogen chloride, and escaped from the Moon’s surface, he said. The abundance of chlorine indicates a lack of hydrogen and water.

“ The amount of water on the Moon was too low for life to possibly have existed there,” he said.

Most scientists believe the Moon was formed when a large object stuck Earth, breaking off a chunk(a vast piece) that has since orbited Earth.

On Earth, goes one theory, water was released as steam form molten basalts(玄武岩) over time, eventually forming bodies of water.

“An understading of whether the Moon was dry or wet will help us understand how water appeared on Earth,” Dr Sharp said.

小题1: A new study indicates that _____ on the moorn.

A．there is plenty of water

B．water is unlikely to exist

C．water existed in the past

D．there is a little water now小题2: The author would like to tell us ______ through the sixth paragraph.

A．why there is no water on the Moon

B．how the Moon was formed

C．when the Earth struck the Moon

D．where the Moon orbited小题3:  Which is NOT true according to the passage?

A. Zachary D. Sharp, a scientist of New Mexico was in charge of the new study.

B. Chlorine isotopes in lunar samples are 25 time larger than those on the Earth.

C. The more aboundant chloride, the shorter hydrogen and water.

D. The new study is benificial to understand how water appeared on Earth.

小题4: What can we learn from the passage?

A．There is enough water on the Earth.

B．Hydrogen chloride easily escaped from the Moon’s surface.

C．The Earth had significant levels of hydrogen.

D．Water on the Earth is directly from molten basalts.

罐内离心泵的叶轮按照结构形式通常采用（）形式。

A.闭式叶轮

B.开式叶轮

C.半开式叶轮

D.双吸式叶轮

在进行民事行政抗诉时，程序违法可能影响案件判决、裁定是法定的抗诉条件之一，它包括以下几种情况（）。

A.主管错误

B.管辖错误

C.审判组织的组成或活动违反法律规定

D.严重违反审判程序

特别行政区立法会 * * 的年龄限制是（）

A.年满五十周岁

B.年满四十周岁

C.年满六十周岁

D.年满三十周岁