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【单选题】
It was stated in astrology that ______.A.
the sun is so distant from us that it was hard to follow its motion
B.
the sun was moving westward around the sky
C.
the motion of the sun is at the rate of about thirty degrees every week
D.
the motion of the sun is similar to the revolution of the earth around the sun
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【简答题】I came across with an old man in rags the other day, he was begging for a living. To be frank, I didn’t know how I ought to give him some money. On the one hand, I am not born in a rich family. On the...
【简答题】化学反应现象可以帮助我们判断化学反应是否发生，但有些化学反应并观察不到明显的现象．实验小组的同学们为了证明NaOH和稀盐酸能发生化学反应，从不同角度设计了实验方案，并进行实验． 【猜想与假设】NaOH和稀盐酸能发生化学反应． 【设计与实验】实验小组的同学们分工合作，按照如下方案分别进行了实验．甲方案：先在NaOH稀溶液中滴加几滴酚酞溶液，然后滴加稀盐酸．．乙方案：用pH试纸测定NaOH的pH，再滴...
【简答题】An old man us to the old house and told us his story.
【单选题】水杨酸和三氯化铁发生呈色反应的原理是
A.
在中性或弱酸性(pH4-6)介质中，水杨酸所含羧基和Fe3+成盐
B.
在中性或弱酸性(pH4-6)介质中，Fe3+氧化其所含酚羟基成醌
C.
在中性或弱酸性(pH4-6)介质中，水杨酸所含酚羟基与Fe3+生成有色配位化合物
D.
在中性或弱酸性(pH4-6)介质中，水杨酸所含酚羟基将Fe3+还原成Fe2+
E.
在中性或弱酸性(pH4-6)介质中，Fe3+水解
【简答题】A. lose B. lead C. the same as D. get on with An old man us to the old house and told us his history. The girl has question yours. I my key to the door of my bedroom yesterday. The boy and the girl...
【简答题】An old man ____ us to the old house and told us his story. (带领)
【单选题】The possibility never occurred to us _____ such an old man killed two women for money. [ ]
A.
how
B.
when
C.
what
D.
that
【单选题】An old man ______ us to the old house and told us his story.
A.
lead
B.
leading
C.
leads
D.
led
【简答题】An old man _______ us to the old house nd told us his story.
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