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【简答题】
（4分）化学就在我们身边，它与我们的生活息息相关。H 、C、O、Na、Cl是初中常见的几种元素，请选用其中的元素写出符合下列要求的物质的化学式。 （1）人体胃液中含有的酸是 . （2）天然气的主要成分是 . （3）生理盐水中含有的盐是 . （4）用于生产洗涤剂的纯碱 .
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举一反三
【简答题】Section B: 33. With the work ( do) , these scientists began to plan another research project.
【简答题】Section B: 33. Their hard work was beginning to pay off, and they believed that the future would be( amazing) bright.
【简答题】Section B: 33. Driving has long been thought of as (efficient) than flying, but according to new research, that is no longer the case.
【单选题】The shopkeepers are complaining that business has been reduced to a ( ) of what before the outbreak of war.
A.
fraction
B.
section
C.
portion
D.
trifle
【简答题】Section B: 33. I would be willing to attend an interview at any time (suit) _ for you.
【简答题】意大利文艺复兴运动起源于十三世纪下半叶。 （ ）
【简答题】欧洲文艺复兴运动起源于英国。（ ）
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