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【单选题】
Travelers now believe that the root cause for failures of British railway isA.
its structural design.
B.
the pursuit of profit.
C.
its inefficient network.
D.
the lack of safety guarantees.
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【单选题】2008年诺贝尔生理或医学奖的获得者发现的人乳头状瘤病毒(HPV)和2009年首先爆发于墨西哥的甲型H1N1流感病毒的遗传物质分别是DNA和RNA。下列有关DNA和RNA的比较正确的是 [ ]
A.
分布上，真核细胞中的DNA全部存在于细胞核中，RNA全部存在于细胞质中
B.
从化学组成上，DNA与RNA的碱基完全不同
C.
结构上，DNA多为双螺旋结构，RNA通常为单链结构
D.
鉴定DNA用吡罗红染色剂，鉴定RNA用甲基绿染色
【多选题】业主大会会议分为定期会议和临时会议。定期会议按照业主大会议事规则的规定由业主委员会组织召开。( )出现时业主委员会应当及时召开业主大会临时会议。
A.
1/3以上业主提议的
B.
20%以上业主提议的
C.
发生重大事故需要及时处理的
D.
发生紧急事件需要及时处理的
E.
业主大会议事规则或者业主公约规定的其他情况
【单选题】to literature when very young, he would not be a master of literature today. A. Were he not exposed B. Were he not to be exposed C. Had he not exposed D. Had he not exposed himself
A.
B.
C.
D.
D
【单选题】to literature when very young, he would be a master of literature today. A. Were he not exposed B. Were he not to be exposed C. Had he not exposed D. Had he not exposed himself
A.
B.
C.
D.
D
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