船用生活污水生化处理的基本原理是将污水中有机物质（）。A．杀死 B．耗氧能力除掉 C

军训结束后，小强想把这几天的军训生活记录下来，请你帮他选一选以下能表现磨砺意志的成语和俗语[     ]

①绳锯木断，水滴石穿

②只要功夫深，铁棒磨成针

③头悬梁，锥刺股

④宝剑锋从磨砺出，梅花香自苦寒

A．①③④

B．①②③

C．①②③④

D．①③

如图用绝缘细丝线悬挂一质量为m、带电荷为q的小球，放在匀强电场中，静止时细线与竖直方向的夹角为θ，则关于小球带的电性和电场强度的大小，下列判断正确的是  

A．小球带正电

B．小球带负电

C．E=mgtanθ/q

D．E=mgcosθ/q

男性，40岁，干部，几天来发热、头痛，口服感冒药无效，T39℃，面红，腹股沟淋巴结黄豆大，后腰部一直径0.5cm焦痂，周围稍红肿

此病人最可能的诊断是（）

A.伤寒

B.斑疹伤寒

C.恙虫病

D.炭疽

E.钧端螺旋体病

阅读理解。

     Everyone should visit a lighthouse at least once.

     The most important reasons for such a visit is to realize how our ancestors (祖先) battled nature with

the basic tools they had. They had only basic ways of creating light, and yet they found a way of using

this simple technology in isolated (孤零零的) places to save ships from hitting rocks.

     Secondly, visiting lighthouses will help us to understand the lives of lighthouse keepers. By their very

nature, lighthouses were built on some rocks of cliffs. Thus, the lighthouse keepers often lived lonely lives.

To walk around their small home, and imagine the angry storm outside beating against the walls, is to take

a step towards understanding the lives they had.

     The reasons for a visit to a lighthouse are not all so backward-looking in time. It is true that lighthouses

were built in out-of-the-way places. But on a pleasant sunny summer day, this very isolation has a natural

beauty that many people will love to experience. Therefore, with the gentle waves touching all round the

lighthouse, the visitor is likely to think it is a world preferable to the busy and noisy modern life.

     Another reason for considering a visit is that the lighthouses themselves can be very attractive buildings.

Mankind could often not be content just to put up a basic structure, but felt the need, even in such an isolated

place, to build with an artistic touch. The result is a view for tired eyes to enjoy.

     Finally, lighthouses have a romantic attraction, summed up by the image of the oil-skin coated keeper

climbing his winding stairs to take care of the light to warn ships and save lives.

1. What is the reason to look back into the past of a lighthouse?

A. To escape from the busy and noisy city.

B. To look for the tools used by our ancestors.

C. To experience the natural beauty of a lighthouse.

D. To learn about the living condition of lighthouse keepers.

2. The underlined phrase "out-of-the-way" in Paragraph 4 means _______.

A. far-away

B. dangerous

C. ancient

D. secret

3. Lighthouses were often built with an artistic touch _______.

A. to attract visitors

B. to guide passing ships

C. to give a pleasant sight

D. to remember lighthouse keepers

4. How many reasons are mentioned for a visit to lighthouse?

A. Three

B. Four

C. Five

D. Six