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听力原文：M: You know that quiz we took in Dr. Turner's class today? Did you know he was going to give it to us? W: Actually I was just as surprised as you were. M: What does the woman mean? (19)A.
Dr. Turner often gives quizzes.
B.
She didn't expect to have a quiz today.
C.
She doesn't know anything about the quiz either.
D.
She didn't know Dr. Turners lecture would be so interesting.
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【单选题】下面的句子正确的是( )。
A.
变压器可以改变交流电的电压
B.
变压器可以改变直流电的电压
C.
变压器可以改变交流电压,也可以改变直流电压
D.
变压器除了改变交流电压,直流电压外,也可以改变交流阻抗
【单选题】指出下面正确的句子是( ) A 、变压器可以改变交流电的电压 B 、变压器可以改变直流电的电压 C 、变压器可以改变交流电压,也可以改变直流电压 D 不清楚
A.
B.
C.
D.
D
【简答题】(8分)下面是有关物质的转化关系图(部分产物已省略)，其中A为单质，E在常温下为液体，D是一种气体，C的相对分子质量为78。请回答相关问题： (1)下列对C的结构、性质推断不正确的是( ) A．久置于空气中会变成白色 B．具有强氧化性 C．晶体中存在离子键与非极性键 D．是一种碱性氧化物 (2)A的原子结构示意图为________，H的电子式为________，E的结构式为________。 (...
【单选题】Passage 3 Questions 11-15 are based on the following passage: What will man be like in the future - in 5000 or even 50000 years from now? We can only make a guess, of course, but we can be sure that h...
A.
how man's life will be in the future
B.
how future man will look like
C.
the fact that man's organs will function differently in the future
D.
the fact that man is growing uglier as time passes
【单选题】Please _____the water tap when you have finished your washing.
A.
turn on
B.
turn oft
C.
turn out
D.
turn over
【单选题】某女, 35 岁,妊娠 37 周。经医生检查胎儿有宫内缺氧的表现,应立即用提高胎儿对缺氧耐受力的药物治疗,你认为下列哪种药物合适
A.
毛花苷丙
B.
哌替啶
C.
10% 葡萄糖 500ml+ 维生素 C2g
D.
肝素
E.
尼可刹米
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