(3)结合(1)(2)说明我国在现代化建设中必须实施什么样的战略。

青年期自我概念的特点是（）。

A.抽象性日益增强

B.处于社会自我阶段

C.结构更加趋同化

D.受同龄人的影响大

6岁患儿自1岁起即发现口唇发绀，活动后加剧，喜坐少动，有蹲踞现象。查：胸骨左缘第2肋间可闻及Ⅱ~Ⅲ级SM，动脉血氧饱和度80％。X线片示心脏呈靴状，心尖钝圆上翘，两侧肺纹理减少。

家长诉说：患儿2岁时在当地医院即已确诊为上述疾病，近年来发绀越来越重，而医生检查说心脏杂音越来越轻。如何解释这一现象（）

A.支气管动脉与肺血管之间形成侧支循环

B.肺动脉狭窄有所减轻

C.左向右分流减少

D.肺动脉狭窄显著加重

E.右向左分流减少

对气焊熔剂的要求是（）。

A、有强烈的腐蚀作用

B、增大熔融金属黏度

C、焊后熔渣易清除

D、降低焊丝与母材熔合度

Questions 91 — 100 are based on the following passage. (15 points)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.

Disguise in Paragraph 4 is closest in meaning to________.

A．reveal

B．hide

C．deliver

D．post

微板法ABO血型定型试验中反定型使用的试剂有哪些（）

A.试剂A1细胞

B.试剂B细胞

C.抗-A

D.抗-B

E、抗血清工作液