2022英语周报新目标八年级第4期答案

22、(8分)(1)①BD(2分)②<(2分)(2)31.25%(2分)75%(2分)【解析】(1)①催化剂只改变速率,对平衡没有影响;k只是温度的函数,温度不变K不变;He的加入不影响体各物质的浓度,平衡不移动;升温正、逆反应都增大,平衡逆向移动,K值减小。②=x03是一个减函数,x增大,y减小(2)C2H2+H2=C2H4C2H2+2H24-x-2y+x+y①②联立,解得x=0.75、y=0.25。0.75+0.25×2100%=31.25%C2H4的选择性0.75100%=75%

One possible versionThe Most Beautiful Place in My HeartAs a 17-year-ol teenager, I ve been to many great cities, among which Luoyang is the most beautiful one inlocated on the north bank of the luo river in western Henan pruvinee l aovany is surrounded by mountains on threesidles, high in the west and low in the east. At the end of 2019, Luoyang had a population of more than 7. I millionI love Luoyang so much due to the fact that as one of the four ancient capitals of China, Luoyang has a civilizationhistory of 5, 000 years. Whats more, the number of its heritage sites is second only to Beijing in cities of China. And itfamous tourist attractions inelude Lungmen Grottoes, Baima Temple, Guanlin and so on

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