| Although no one is certain why
migration occurs, there are several theories. One theory claims that prehistoric
birds of the Northern Hemisphere were forced south during the Ice Age. As the
glaciers melted, the birds came back to their homelands, spent the summer, and
then went south again as the ice advanced in winter. In time, the migration
became a habit in spite of the disappearance of glaciers. Another theory proposes that the ancestral home of all modern birds was the tropics. When the region became overpopulated, many species were crowded north. During the summer, there was plenty of food, but during the winter, scarcity forced them to return to the tropics. A more recent theory suggests a relationship between increasing daylight and the stimulation of certain glands(腺)in the birds’ bodies that may prepare them fo A. exact reasons for migration are not known B. birds migrate because of changes in temperature C. the ancestral home of all birds was the tropics D. glaciers caused birds to migrate [判断题]重大活动开始前，举办地公司应依据国家、电力行业标准，在重大活动举办方或政府电力管理部门的主导下，开展重大活动保电客户供用电隐患排查工作。
A.正确 B.错误 [单项选择]Passage 6
Globalization is a phenomenon and a revolution. It is sweeping the world with increasing speed and changing the global landscape into something new and different. Yet, like all such trends, its meaning, development, and ’impact puzzle many. We talk about globalization and experience its effects, but few of us really understand the forces that are at work in the global political economy.
When people use their cell phones, log onto the Internet, view events from around the world on live television, and experience varying cultures in their own backyards, they begin to believe that this process of globalization is a good thing that will bring a variety of new and sophisticated changes to people’s lives. Many aspects of this technological revolution bring fun, ease, and sophistication to people’ s daily lives. Yet the anti-World Trade Organization (WTO) protests in Seattle, Washington in 1999 and Washington, D.C. in 2000 are graphic illustrations of the fact that not ev
A. brings inexpensive products B. creates disagreements between people C. leads to cultural change and harm D. artifices the lives of people [多项选择]无线电波的传播形式（）。
A. 直射波 B. 反射波 C. 衍射波 D. 散射波 [单项选择]当普通混凝土强度试件边长采用100mm时，强度折算系数为（）。
A. 0.95 B. 1.00 C. 1.05 D. 1.10 [判断题]要强化师德考核结果的运用,建立师德考核前置审核制 度。师德考核不合格者年度考核应评定为不合格。( )
A.正确 B.错误 [单项选择]新发的或是原有劳力性心绞痛恶化加重，发作时ST段下移≤1mm，持续时间<20分钟，临床称（）
A. 重度组 B. 高危组 C. 低危组 D. 轻度组 E. 中危组 [单选题]红花花粉粒的表面特征是
A.近于光滑 B.有细小凹点 C.有齿状凸起 D.有网状雕纹 E.有点状条形雕纹，自两极向四周呈放射状排列 [单选题](52447)暖水瓶应有（）。(1.0分)
A.支架 B.防倒圈（架） C.防烫措施 D.安全措施 [单项选择]与强直性脊柱炎的发病关系最为密切的因素是（）
A. 肠道细菌感染 B. 肺炎克雷伯杆菌 C. HLA-B27 D. 链球菌感染 E. 泌尿系感染 [单项选择]在细胞周期中的肿瘤细胞，对放射线最敏感的细胞期是（）。
A. S期和G2/M期敏感性相同 B. G0/G1 C. G2/M D. S E. 以上各期细胞敏感性相同 [单项选择]土地登记所指的土地位置是指土地的（）。
A. 座落 B. 四至 C. 座落和四至 D. 土地所处地段的优劣 我来回答: 提交
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