二、根据下面的数据回答121～125题。价格下降幅度最大的商品是（）。 A．大宅门

活动小天地。       

       太阳对于地球都有哪些重要的作用？想一想，再搜集信息，和同学们交流一下，把你们知道的写下来。

声音的强弱叫做         ，其大小是由振幅决定的，敲鼓时，用力越大，声音越响就是因为                             。

Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (16) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (17) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (18) .

A. virtual B. virus C. wormsD. bacteria

As administrators seek to block dangerous email attachments through the recognition of well-known (19) , virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and will still run and successfully infect target users.
Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the (20) access to your network.

按《国家电网公司输变电工程达标投产考核办法》规定，工程达标投产批复单位每（）对通过达标投产考核的工程项目以文件形式进行一次批复。

A.月

B.季度

C.半年

D.年

如何获得可靠的灰分测定结果？