2022英语周报八年级河南唐河答案

24.C【解析】原料气中氢气的作用是活化固体催化剂,同时氢气也是丁烷催化脱氢的生成物,由图1可知维持一定的进料比[(氢气],有利于提高丁烯的产率,当[”(氢气)n(丁烷过大时,丁烯的产率呈下降趋势。由图2可知,当温度低于590℃左右时,丁烯的产率随温度升高而不断增大,当温度高于590℃左右时,副产物增多,丁烯产率下降。故选C项。

、写作(共两节,满分35分)第一节短文改错(共10小题;每小题1分,满分10分)Last Saturday, my classmates and I went to the Chinese Academy of Sciences, what was aprecious chance to get closely to science. The moment whan we arrived there, we were warmlygreeted by an expert stood at the entrance. To have A better understanding of daily basic science,standingwe first attend a professional lecture on the theme of life and Water. The highlight of the visitattendedvere the hands-on experience in the science lab Under the guidances of the expert, we gotinvolved in a medical experiment with great enthusiasm Through the meaningful activity we allagree science plays an important role in our life. We are determining to study hard to understanddeterminedthem

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