下列说法正确的是（
A．PM2.5的产生与人类活动无关
B．在涂料中尽量用液态有机牡代替水作溶剂，以减少环境污染
C．酒精可使蛋白质变性，故能消毒最菌
D．塑化剂是一种化工塑料添加剂，可以备量添加到婴幼儿玩具中
答案：C
题目分析：A、PM2.5的产生丛要来自于化石燃斘的燃僧，与人类活动有关，错误；B、液态有机溶剂有一定的毒性，对人体有害，如甲醛、苯等，所以不能用有机溶剂代替水作溶剂，错误；C、酒精可以使蛋白质变性，故能消毒杀菌，正确；D、塑化剂是一种化工塑料添加剂，对人体有害，根据婴幼儿的特点，不能大量添加到婴幼儿玩具中，错误，答案选C。
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| Li Mei has a new classmate from New York. His 1 is Peter. Everything here 2 new to him. He doesn't speak Chinese, but he speaks good English. He can 3 many games, too. Miss Yang asked Li Mei to 4 him to speak Chinese. Li Mei was very 5 . She thought she could 6 English from Peter. Now she can speak 7 English and Peter can 8 some Chinese words. Now they are 9 at table and having 10 at school. Li Mei teaches him how to use chopsticks. | ||||
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