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【简答题】
鞣质又称或鞣酸,是植物界中一类结构比较复杂的{1}类化合物。
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皮皮学刷刷变学霸
举一反三
【判断题】Section B True or False (1'×10=10’)Directions: Decide whether the following statements are true or false according to the texts we have learned in our textbook. If it is true, please choose A on the a...
A.
正确
B.
错误
【判断题】Section B True or False (1'×10=10’)Directions: Decide whether the following statements are true or false according to the texts we have learned in our textbook. If it is true, please choose A on the a...
A.
正确
B.
错误
【单选题】新中国成立之初，城镇居民用于吃和穿的开支占到全部生活费支出的80％，农村居民甚至超过90％。改革开放以来，我国居民恩格尔系数不断下降，2008年我国城乡居民的恩格尔系数分别达到37.9％和43.7％。这表明（） ①我国居民消费层次和消费质量不断提高 ②我国居民消费结构得到改善 ③我国居民的生存资料消费逐渐增加 ④我国居民用于食品支出的比重越来越少
A.
①②③
B.
①③④
C.
①②④
D.
②③④
【单选题】下面表达中，选出比较客观简洁的一项。
A.
If you can control the trains this way, they will be able to run more safely and quickly.
B.
The use of this method of control unquestionably leads to safer and faster train running.
C.
We can use this method to control the trains to make them run more safely and quickly.
D.
It is undboubted that trains can run more safely and quickly if they are controlled in this way.
【单选题】下面表达中，选出比较客观的一项。
A.
We analyzed the experiment and what we found made us realize that the technique is quite complex.
B.
The analysis and findings of the experiment reveal that the technique is quite complex.
C.
Our analysis and findings of the experiment make me puzzled .
D.
The analysis and findings of our experiment show that the technique is too puzzling .
【单选题】改革开放以来，我国城乡居民家庭恩格尔系数显著下降。从1978年到2007年，城镇居民家庭恩格尔系数由57．5％下降到36．3％；农村居民家庭恩格尔系数由67．7％下降到43．1％。根据材料，下列说法正确的是（）
A.
城乡居民生活水平总体呈下降趋势
B.
城乡居民生活水平总体呈上升趋势
C.
城镇居民生活水平不断提高，农村居民生活水平不断下降
D.
农村居民生活水平不断提高，城镇居民生活水平不断下降
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