患者男性，68岁。因原发性肝癌、肝功能失代偿期住院治疗，期间患者出现扑翼样震颤，最可能的原因是（）
A.二氧化碳潴留，脑水肿
B.氨中毒，颅内压升高
C.重度缺氧
D.肝性脑病
E.水、电解质平衡紊乱
参考答案：D
解析：原发性肝癌失代偿期，患者肝脏清除血氨能力下降，致使肠道的氨未经肝脏解毒而直接入体循环，透过血脑屏障入脑组织，引起肝性脑病，出现扑翼样震颤是肝性脑病的重要临床表现。
PART FOUR WRITING SECTION A Directions: Read the following passage. Complete the diagram by using the information from the passage. Write NO MORE THAN 3 WORDS for each answer. Supplying energy by nuclear power is a new trend in the recent years. However, it may be very dangerous. First, the radioactive material must travel from its place of production to the power station. Although the power stations themselves are strongly built, the containers used for the transport of the materials are not. Normally, only two methods of transport are in use, namely, road and rail. Unfortunately, both of these may have an effect on the general public, since they are sure to pass near, or even through, heavily populated areas. Second, there is a problem of waste. All nuclear power stations produce wastes that in most cases will remain radioactive for thousands of years. It is impossible to make these waste non radioactive, so they must be stored in one of the inconvenient ways that scientists have invented. For example, they may be buried under the ground, or dropped into deserted mines, or sunk in the area. However, these methods do not solve the problem, since an earthquake could easily break the containers. Third, there may occur the danger of a leak or an explosion at the power station. As with the other two dangers, this is not very likely, so it doesn’t provide a serious objection to nuclear program. However, it can happen. Separately, these three types of dangers are not a great cause for worry. Taken together, though, the probability of disaster is extremely high. Title: 71 of Nuclear Power
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