抛物线y2=-8x中，以点（-1，1）为中点的弦所在的直线的方程为（）. A．x-4

下列发展能力状况修正指标中，（）指标越高，表明企业所有者权益得到的保障程度越大，企业可以长期使用的资金越充足，抗风险和保持连续发展的能力越强。

A.总资产增长率

B.三年利润平均增长率

C.三年资本平均增长率

D.经营亏损挂账比率

初步可行性研究是对拟建工程项目进行初步分析，论证项目投资建设的（ ）。

A．合法性和盈利性

B．可靠性和经济性

C．必要性和可能性

D．实用性和高效性

A、B、C、D、E、F、G均为前20号元素组成的常见化合物，且A、B、C、E均为二元化合物，它们之间有下图所示的转化关系．A是形成酸雨的最主要物质，C一般既可以和酸酐化合，也可以和碱性氧化物化合；当B、E分别与C反应时都放出大量的热，稀释D的浓溶液时也放出大量的热．试回答以下问题：

（1）属于氧化物的是______（填物质代号）．

（2）C的电子式为______．

（3）图中，既属于化合反应又属于氧化还原反应的是______（填反应编号）

（4）若加热从水溶液中析出的G的晶体，则发生反应的化学方程式为：______．

（5）F的粉末和D的稀溶液______（填“能”或“不能”）反应，原因是______．

Winter is dangerous because it’s so difficult to know what is going to happen and accidents take place so easily. Fog can be waiting to meet you over the top of a hill. Ice might be hiding under the melting (融化) snow, waiting ahead to send you off the road. The car coming to you may suddenly slip（滑） across the road.

Rule No.1 for driving on icy roads is to drive smoothly (平稳地). Sudden movements can make a car very difficult to control. So every time you either start or stop your car, increase or reduce your speed, you must be as gentle and slow as possible. Suppose you are driving with a full cup of hot coffee on the seat next to you. Drive so that you wouldn’t spill (溅) it.

Rule No.2 is to pay attention to what might happen. The more ice there is, the further down the road you have to look. Test how long it takes to gently stop your car. Remember that you may be driving more quickly than you think. Generally, allow twice of your usual stopping distance when the road is wet, three times this distance on snow than usual, and even more on ice. Try to stay in control of your car at all time and you will not get into trouble.

小题1:The writer tries to _____ in this passage.

A．show his dislikes about bad winter weather

B．give information about winter weather

C．ask people not to drive in winter

D．advise people about safe driving in winter小题2:According to the passage, the writer thinks that _______.

A．people should not drive in the snow

B．drivers should think more about problems in winter driving

C．people drive too fast in winter

D．winter drivers should stop their cars less小题3:In the passage the writer talks about a cup of coffee ______.

A．to show how important smooth movements are

B．to ask the drivers to bring some soft drinks with them

C．to tell the drivers to be more relaxed

D．to show how it can be spilled小题4:Which of the following is NOT true?

A．Traffic accidents take place easily in winter.

B．Fog and melting snow often cause car accidents.

C．The stopping distance on ice is as long as the usual one.

D．In winter you should drive your car with great care.

如图箭头所示绿色范围感觉为上肢哪根神经（）

A.桡神经

B.尺神经

C.腋神经

D.正中神经

E.肌皮神经