(注意:短文中共有10处错误,在答题规范的情况下,找到一处错误并修改正确得1分:若找到一处错误但没有改对得0.5分。)In recent years, the sandstorm in the northem part of China has become/ more and morecommon natural disaster. The strong wind blows up some sand, making them difficult foItpeople to go out Sandstorms are caused by a variety of reason. Frst, in the past people feed areasonsgreat number of sheep. As a result the sheep ate so many grass that the land tuned intomuchdeserts. Second, people were not concerming about protecting forests, and cut down manyconcernedtrees. that caused the loss of soil when it comes to improve the situation, the governmentwhichImproving.starts to stress at the importance of the environment. I believe final the problem will be solvedfinally+in the near future.

25.C【命题意图】本题考查物质性质探究,意在考查考生科学探究和创新意识的学科核心素养。【解题思路】NaCO溶液具有强氧化性,可使pH试纸褪色,无法测出pH,A错误;应先加入淀粉溶液,最后加入硫酸,否则匚与硫酸先发生反应,观察不到蓝色变化,B错误;向酸性高锰酸钾和草酸的混合液中加入一小块硫酸锰固体,生成气体的速率加快,溶液迅速褪色说明硫酸锰是该反应的催化剂,使反应速率加快,C正确;高锰酸钾与草酸反应的化学方程式为2KMnO,+ 5H2 C2 O+3H2 SO2MnSO,tK2SO4+10CO2↑+8H2O,两支试管各盛0.1mol/L4ml酸性高锰酸钾溶液,分别加人O.1molL2mI草酸溶液和0.2mol/L2mL.草酸溶液,反应中高锰酸钾过量,颜色不会完全褪去,D错误。

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