消化性溃疡穿孔患者腹痛的性质是（） A.剧烈刀割样疼痛 B.钻顶样疼痛 C.胀痛 D

系统软件和应用软件的相互关系是（）。

A.前者以后者为基础

B.后者以前者为基础

C.相互没有关系

D.相互支持

我行账户黄金报价采取的是做市商模式，由我行进行买入价和卖出价的报价。（）

______是计算机应用中最广泛的领域。

阅读理解。

     The global energy crisis is approaching. What can we do? Here are some steps you can take.

     Cooling puts the greatest stress on your summer energy bill and the power grid (电网). Just as a tune-up

for your car can improve your gas mileage, a yearly tune-up your heating and cooling system can improve

efficiency and comfort. Clean or replace filters monthly or as needed.

     For central air conditioning systems and room sir conditioners, look for the ENERGY STAR, the federal

government's symbol for energy efficiency. For central air, purchase the system with the highest possible

Seasonal Energy Efficiency Ratio (SEER).

     Use energy-efficient ceiling fans either alone or with air conditioning Ceiling fans do a great job of

circulating air. When used with air conditioning, fans allow you to raise the thermostat (恒温器) and cut

costs. Ceiling fans cool people, not rooms, so before you leave, turn off the ceiling fan.

     Let a programmable thermostat "remember for you" to automatically adjust the indoor climate with your

daily and weekend patterns to reduce cooling bills by up to 10 percent. You can come home to a comfortable

house without wasting energy and cresting pollution all day while you are at work.

     Try to make your home airtight enough to increase your comfort, make your home quieter and cleaner

and reduce your cooling costs up to 20 percent.

     Cut your air conditioning load, and reduce pollution by planting leafy trees around your home and fixing

reflective bricks on your roof.

     Close blinds or shades on south-and west-facing windows during the day, or fix shading equipment to

avoid beat build-up.

     Turn off everything not in use: lights, TVs, computers. And use fluorescent bulbs (荧光灯), which provide

bright, warm light while using at least two-thirds less energy, producing 70 percent Jess beat and lasting up

to 10 times longer than incandescent bulbs (白炽灯).

     Drive the car that gets better gas mileage whenever possible if you own more than one vehicle. If you

drive 12,500 miles a year, switching 10 percent of your trips from a car that gets 20 miles per gallon to one

that gets 30 mpg will save you more than $65 per year.

     Carpool. The average U.S. commutes (乘车上班族) could save about $260 a year by sharing cars twice

a week with two other people in a car that gets 20.1 mpg-assuming the three passengers share the cost of gas.

1. According to the passage, the thermostat is used to _____.

A. make rooms quieter

B. control room temperature

C. turn off the air conditioner

D. reduce room air pollution

2. We can conclude from the passage that the author probably discourages _____.

A. planting leafy trees around your home

B. turning off the ceiling fan before you leave your house

C. keeping your south-facing windows open during the day

D. using fluorescent bulbs instead of incandescent bulbs

3. According to the passage, you can save fuel by _____. 

A. using energy-efficient ceiling fans

B. sharing cars with others on workdays

C. turning off everything not in use

D. reducing 10% of your car trips every year

4. This passage is mainly about _____.

A. energy-saving tips

B. fuel-saving tips

C. do it yourself tips

D. environment-protecting

黄瓜生长发育需要一定的昼夜温差，一般维持（）左右温差有利于营养物质的积累。