患者前额部疼痛，伴见面红，牙痛，便干，舌红苔黄，脉弦。处方用药加用白芷，其“引经报使

48，52，( )，74，90，108，127

A．56

B．60

C．61

D．68

A huge cloud of dust rose and an overpass disappeared. This was the scene in Zhuzhou，Hunan Province on May 17.Nine people were killed and 16 injured.

Things were similar last year in the Sichuan earthquake. Thousands of people were buried in the ruins and lost their lives. What if we could have warned them?

People are always racking their brains to find a way of preventing buildings’ collapse. Better materials and technology help，but they are not a solution.

Just like humans，a building has its own life cycle from “birth” to “death”．If we know when a building is going to collapse，we can repair it in advance or get out of it before it falls.

Now，scientists at the University of Illinois have developed a material that turns red before it breaks. The invention could be used in things like climbing ropes or bridge supports.

The research was led by Nancy Sottos，a professor at the university’s Beckman Institute，and Douglas Davis，a graduate research assistant.

The secret behind the color­changing material is a type of molecule (分子)．A molecule is a group of atoms held together by chemical bonds. Imagine you and your friends standing in a circle，holding hands. Each person stands for one atom，your hands represent the bonds，and the entire circle represents a molecule. If one person lets go of his or her hands，the molecule changes color.

The research team put the molecule into a soft material. When the researchers stretched the material，it turned bright red for a few seconds before it broke into two pieces. When they repeatedly stretched and relaxed the material，without breaking it，it only turned a little red.

The major problem is that light can get rid of the red color. When the team shone bright light on the molecule，the broken bond was fixed，and the color disappeared.

If the bright light keeps the red color from appearing，the material’s warning system will be useless. Scientists still have a lot of work to do before the color­changing molecules can be used outside the lab.

小题1:What does the passage mainly introduce?

A．The collapse of an overpass in Zhuzhou，Hunan Province.

B．The Sichuan earthquake

C．A material that turns red before it breaks.

D．A way of preventing building from collapsing.小题2:The underlined words “racking their brains” in the third paragraph mean ________.

A．suffering a lot

B．collecting beyond imagination

C．losing a lot

D．thinking very hard小题3:Which of the following is a WRONG statement?

A．Thousands of people died from the collapse of buildings in the Sichuan earthquake because they hadn’t been warned.

B．There is no building that will never collapse.

C．A new material has been applied to buildings to warn people of collapse.

D．A color­changing material can turn red before it breaks.小题4:What can we infer from the passage?

A．The color­changing molecules are certain to be used outside the lab.

B．There will be no collapse with the help of the color­changing material.

C．There is a long way to go before the material can be applied.

D．The problem caused by bright light will be solved by scientists.

在生产性建设工程项目中，设备及工器具投资占项目投资比重的提高，意味着（）的提高。

A.生产技术的进步和资本有机构成

B.工程造价的提高和资本有机构成

C.生产成本的降低和生产技术的进步

D.建设成本的降低和生产技术的进步

为保证能提供充足的电能，一般在设计风力发电站时需考虑各种因素。如，建造一座50兆瓦的电站，并不是说由50台1兆瓦的风力发电机简单并联，这只是在最佳风源的情况下能够实现的；如果风速降低，其功率可能只能达到25兆瓦。因此，建造时就需要安装100台风力发电机，这样，在风速较低时才仍能提供足够的电能：但风速高时，同时工作又会出现电力过剩的情况。这时就可以将空气压缩进地下储气站，到需要时再放出。对文中所说建造50兆瓦电站需要100台1兆瓦电机的必要性理解正确的一项是( )。

A．为开辟全新的能源提供新途径，充分利用取之不尽的风力和空气

B．为空气发电机提供足够数量的可供压缩储存的空气

C．充分考虑风源状况，确保在风速较低时也能提供符合设计要求的足够电能

D．综合使用风力发电和空气发电技术，使之相互补充、相互利用

以下哪种方法是防止便携式计算机机密信息泄露的最有效方法？（）

A、用所有者的公钥对硬盘进行加密处理

B、激活引导口令（硬件设置口令）

C、利用生物识别设备

D、利用双因子识别技术将登录信息写入记事本