昼夜节律

After a fortnight of extraordinary type, the much-feared computer virus that was supposed to strike the globe’s hard drives last Friday simply fizzled. So many warnings were sounded that most computer owners either fed anti-virus programs into their systems or refused to turn the power on during the dreaded M-day. They dodged one disease, but more strains are on the way. The eponymous Friday-the-13th virus is due to strike this week, and the Maltese Amoeba may detonate on March 15.

Who creates these things? A disproportionate number seems to originate in Bulgaria or Russia, where writing the smallest, most elegant virus programs has become a matter of quirky pride. Viruses are transmitted either by shared disks (as was Michelangelo) or over telephone lines. The virus program hides in a computer until, activated by a date, time, or some other trigger, it springs to life. The most common virus, Stoned, makes your screen announce: “Your computer is now stoned. Legalize marijuana. ” (Regardless of your politics, you don’t want this one around; it can damage your files inadvertently.) Solution: either keep your computer isolated—no trading disks, no on-line communication—or else install one of a dozen or so commercially available anti-virus programs that detect and delete the little time bombs. If they can come up with a virus that is hidden, will they next try to extort a business?—as in, pay me $1 million or my virus will destroy your system.

In the meantime, money is being made by firms selling anti-virus programs. Egghead software stores logged a 3,000 percent jump in anti-virus sales. Was the threat overblown by the companies that make millions selling anti-virus software? Thanks to the media blitz, no one will ever know what might have happened—an unallied number of computer owners discovered and deleted Michelangelo before it was supposed to strike—on the artist’s birthday.

小题1:The much-feared M-day was ________.

A．Friday-the-13th when the eponymous virus was due to strike

B．Friday-the-15th when the Maltese Amoeba would be activated

C．the previous Friday when Michelangelo virus was due to strike

D．the previous Friday which coincided with the artist's birthday小题2:Computer viruses are ________.

A．diseases spread from one computer to another by shared disks

B．viruses hidden in a computer’s instructions by the designers

C．little time bombs hidden in a computer waiting to be triggered

D．just those computer programs created by malevolent designers小题3:Which of the following sayings fits the Michelangelo virus?

A．A burnt child dreads the fire.

B．The bug’s bark was worse than its bite.

C．A barking dog seldom bites.

D．Once bitten, twice shy.小题4:The author implies that in days to come the viruses might be used ________.

A．to destroy data

B．to commit crimes

C．to commit mischief

D．to create confusion

市场上常有这样一种现象：当一种商品热销后，马上就会有大量的同类商品涌向市场。这自然会造成这一商品市场竞争程度的加剧。
从上面的现象中能推出下面哪项结论

A．某一商品市场竞争日趋激烈，所以这种商品正处于热销之中。

B．某一商品并未热销，所以这一商品市场竞争不会激烈。

C．某一商品在市场上未遇到竞争，所以它在市场上不热销。

D．某一商品市场极为平淡，所以没有可能热销的商品。

E．某一商品刚进入市场，所以它不会面临竞争。

试述决定工作满足的因素有哪些。

根据《中华人民共和国环境保护法》。以下关于防治环境污染和其他公害的措施不当的是（）。

A、建设项目中防治污染的设施，必须与主体工程同时设计、同时施工、同时投产使用

B、排放污染物的企事业单位，必须依照国务院环境保护行政主管部门的规定进行申报登记

C、对造成环境污染严重的企事业单位必须立即关闭

D、禁止引进不符合我国环境保护规定要求的技术和设备

下列各项中，符合房产税规定的是（）。

A.产权属于集体的，不缴纳房产税

B.房屋产权出典的，由出典人缴纳房产税

C.无租使用房产管理部门的房产由使用人代为缴纳房产税

D.产权属于国家所有的，不缴纳房产税