下列对Windows的叙述中正确的是()。A.Windows为每个任务自动建立一个显

落实党的农村经济政策以后，粮食生产增加不少，然而农村的集市贸易也很活跃。

MG患者如急骤发生延髓支配肌肉和呼吸肌严重无力，出现呼吸麻痹，以致不能维持换气功能时即为_________。

从给出的几句话中选出没有语病的一句：()

A．上海市各中、小学在开展整顿校风校纪的活动中，注意对学生进行思想品德教育，引导和培养学生勤奋学习、遵守法纪的自觉性和主动性

B．对于文学作品应该如何反映现实这个问题上，我们曾经展开一场讨论

C．在调整中，他们以提高产品质量为中心，抓紧搞好产品设计、工艺、工装、设备、计量、标准等技术基础工作的整顿

D．小说《吕梁英雄传》的作者是马枫、西戎和写的

若有以下程序段； #include＜iostream＞ using namespace std； int main() {int a[]={1，4，5}；int *p=&a[0]，x=6，y，z；for(y=0；y＜3；y++) z=((*(p+y)＜x) *(p+y)：x)；cout＜＜z＜＜end1；return 0； } 程序运行后的输出结果是( )。

A．1

B．4

C．5

D．2

Electronic mail has become an extremely important and popular means of communication.
The convenience and efficiency of electronic mail are threatened by the extremely rapid growth in the volume of unsolicited commercial electronic mail. Unsolicited commercial electronic mail is currently estimated to account for over half of all electronic mail traffic, up from an estimated 7 percent in 2001, and the volume continues to rise. Most of these messages are fraudulent or deceptive in one or more respects.
The receipt of unsolicited commercial electronic mail may result in costs to recipients who cannot refuse to accept such mail and who incur costs for the storage of such mail, or for the time spent accessing, reviewing, and discarding such mail, or for both. The receipt of a large number of unwanted messages also decreases the convenience of electronic mail and creates a risk that wanted electronic mail messages, both commercial and noncommercial, will be lost, overlooked, or discarded amidst the larger volume of unwanted messages, thus reducing the reliability and usefulness of electronic mail to the recipient. Some commercial electronic mail contains material that many recipients may consider vulgar or pornographic in nature.
The growth in unsolicited commercial electronic mail imposes significant monetary costs on providers of Internet access services, businesses, and educational and nonprofit institutions that carry and receive such mail, as there is a finite volume of mail that such providers, businesses, and institutions can handle without further investment in infrastructure. Many senders of unsolicited commercial electronic mail purposefully disguise the source of such mail.
Many senders of unsolicited commercial electronic mail purposefully include misleading information in the messages’ subject lines in order to induce the recipients to view the messages. While some senders of commercial electronic mail messages provide simple and reliable ways for recipients to reject (or ’opt-out’ of) receipt of commercial electronic mail from such senders in the future, other senders provide no such ’opt-out’ mechanism, or refuse to honor the requests of recipients not to receive electronic mail from such senders in the future, or both.
Many senders of bulk unsolicited commercial electronic mail use computer programs to gather large numbers of electronic mail addresses on an automated basis from Internet websites or online services where users must post their addresses in order to make full use of the website or service.
The problems associated with the rapid growth and abuse of unsolicited commercial electronic mail cannot be solved by the government alone. The development and adoption of technological approaches and the pursuit of cooperative efforts with other countries will be necessary as well.

Which of the following is NOT true about unwanted e-mail

A．It costs money to receive them.

B．It’s free to store them.

C．It takes time to access them.

D．It takes time to throw them away.