计算机病毒是指能够侵入计算机系统，并在计算机系统中潜伏、传播、破坏系统正常工作的一种

甲向乙借款1万元，而乙欠甲3万块砖。甲的债务于2008年2月9日到期，乙的债务于2008年8月8日到期。2008年2月10日，甲与乙经过协商达成协议，两笔债务相抵，双方互不相欠。甲与乙的行为属于（）。

A.清偿

B.混同

C.合意抵销

D.法定抵销

阅读下面短文并回答问题，然后将答案写到答题卡相应的位置上（请注意问题后的词数要求）。

（1） Everybody has to buy or sell things sometimes．Even students who are usually not very rich, have

to learn something about making purchases intelligently．As a student, you may find, for example, that

you need to buy a walkman or winter clothing．You may want to buy a television or a used car．Of course,

you want to get good value for your money．If you are considering a major purchase, or any purchase you

should remember several important things．

（2） Study first, and then decide what to buy．You can get enough information just by reading books

and advertisements．

（3） Remember that a high quality product will probably last longer and work better．Of course, for a

superior product you ______________．An inferior product may not give you the same quality,

but the price could be low．A poor quality product could be expensive and a valuable one could be on sale

at a greatly reduced price．

（4） Don't worry．Take your time．After you decide what product you want to buy, go to many

different stores．If you cannot find the product you want, you try to order it directly from the factory or

ask the store to order it for you．

（5） Look for a good deal．If you wait, you may probably find that your product will go on sale and

you may be able to save 10,20, or even 50 percent of the original price．

（6） Finally, before you buy, make sure that that product is guaranteed．If you find the lowest possible

price, you will generally be happy with your purchase and also keep more money in the bank．

小题1:What is the main idea of the passage? （no more than 8 words）

小题2:What should you care more while shopping? （no more than 5 words）

小题3:Fill in the blank in Paragraph 3 with proper words．（no more than 5 words）

Of course, for a superior product you

小题4:How can you get good value for your money? （list at least two things） （no more than 20 words）

小题5:What does‘the underlined’word“one"’refer to in paragraph 3？

科学研究表明地球的自转在变慢．四亿年前，地球每年是400天，那时，地球自转的周期为21.5h，科学家们猜想，地球自转变慢的原因主要有两个：一个是潮汐时海水与海岸碰撞、与海底摩擦而使能量变成内能；另一个是由于潮汐的作用，地球把部分自转能量传给了月球，使月球的机械能增加了（不考虑对月球自转的影响），由此可以判断，与四亿年前相比，现在月球绕地球公转的（　　）

A．半径减小

B．周期增大

C．线速度增大

D．角速度增大

确定职业性肿瘤病因的主要依据应来自

A．病例分析

B．细胞学检查

C．病理学检查

D．动物实验

E．流行病学调查

可用于抵偿华夏银行债务的资产是（）。

A、在建工程资产

B、已确定要被征用的土地使用权及地上建筑物

C、产权关系明确的不动产

D、法律规定的禁止流通物