下列哪项不是乳岩肿块的特点（） A.无痛无热 B.皮色不变 C.表面光滑 D.质地坚

材料一：2011年11月16日9时15分，甘肃庆阳市正宁县榆林子镇西街道班门口，发生了一起重大交通事故。一辆向东行驶的“陕D72231”大翻斗运煤货车，与一辆向西行驶的榆林子镇小博士幼儿园核载9人，但实际载有64人的校车相撞。截至20日，甘肃正宁幼儿园校车事故共造成21人遇难，包括19名儿童，受伤的43名儿童还在接受救治。校车安全问题再度引发社会的强烈关注。

材料二：官方分析校车事故五大原因：

●校车驾驶人员安全意识淡薄，严重违规超载，左道超速逆行；

●幼儿园私自改装车辆，逃避监管，车辆限定9座改装为无座；

●幼儿园董事长李军刚安全责任意识不强，对所辖737名学生只安排4辆校车接送，没有尽到第一责任人责任；

●因大雾天气影响，货车和校车司机遇到紧急情况处置不力；

●教育、交警部门监管不力。

截至17日晚，事故遇难人数升至21人。正宁县委常委、常务副县长刘光润等有关负责人被停职调查。

11月19日，甘肃省正宁县人民检察院依法对“11·16”重大交通事故犯罪嫌疑人李军刚以涉嫌交通肇事罪批准逮捕。

材料三：2011年11月27日，温 * * 出席第五次全国妇女儿童工作会议并讲话时强调：要预防和避免儿童各种意外伤害，特别要加强校园治安、消防安全和校车交通安全工作。国务院已责成有关部门迅速制订校车安全条例，抓紧完善校车标准，做好校车设计、生产、改造、配备等工作，并建立相应管理制度。做好校车工作所需资金由中央和地方财政分担，多方筹集。要明确地方政府和部门责任，严格责任追究制，对发生的恶性事故要依法严肃处理。要通过中央、地方和社会各界共同努力，使校车成为学生安全的流动校舍，为孩子们建立起安全无忧的绿色通道。

阅读材料，结合所学知识，回答下列问题：

（1）材料一和材料二分别说明了什么？它对我们有什么启示？

________________________________________________________________________________

（2）材料三说明了什么？为什么？

________________________________________________________________________________

（3）你认为怎样才能杜绝类似事故的发生？

________________________________________________________________________________

机动车在高速公路上发生故障时，警告标志应当设置在故障车来车方向（）米以外，车上人员应当迅速转移到右侧路肩上或者应急车道内，并且迅速报警。

A.100

B.150

C.200

D.300

在酒精性肝损伤时升高最明显的是（）。

A.丙氨酸氨基转移酶

B.天冬氨酸氨基转移酶

C.γ-谷氨酰转移酶

D.碱性磷酸酶

E.乳酸脱氢酶

玻璃具有良好的性能是指（）

A、透明性

B、保温性

C、隔声

D、韧性

The idea of test-tube babies may make you either delighted at the wonders of modern medicine or irritated while considering the moral, or legal, or technological implications of starting life in a laboratory. But if you’’ve ever been pregnant yourself, one thing is certain: You wonder what it’’s like to carry a test-tube baby. Are these pregnancies normal Are the babies normal The earliest answers come from Australia, where a group of medical experts at the Queen Victoria Medical Center in Melbourne have taken a look at the continent’’s first nine successful invitro pregnancies. The Australians report that the pregnancies themselves seemed to have proceeded according to plan, but at birth some unusual trends did show up. Seven of the nine babies turned out to be girls. Six of the nine were delivered by Caesarean section. And one baby, a twin, was born with a serious heart defect and a few days later developed life-threatening problems.What does it all mean Even the doctors don’’t know for sure, because the numbers are so small. The proportion of girls to boys is high, but until there are many more test-tube babies no one will know whether that’’s something that just happened to be like that or something special that happens when egg meets sperm in a test tube instead of a fallopian tube. The same thing is true of the single heart defect. It usually shows up in only 15 out of 60,000 births in that part of Australia, but the fact that it occurred in one out of nine test-tube babies does not necessarily mean that they are at special risk. One thing the doctors can explain is the high number of Caesareans. Most of the mothers were older, had long histories of fertility problems and in some cases had had surgery on the fallopian tubes, all of which made them likely candidates for Caesareans anyway.The Australian researchers report that they are quite encouraged. All the babies are now making normal progress, even the twin with the birth defects.

Which of the following statements about the experiment mentioned in the passage is true

A．Only the twins are defected.

B．Most of the babies are delivered by means of Caesarean.

C．There are some troubles during all mothers’ pregnancies.

D．One baby appears to be abnormal.