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【单选题】
日常生活中，到化学知识。下列说法不正确的是A.
某些铁盐溶于水生成的Fe（OH) 3 胶体，可除去水中的悬浮颗粒等杂质
B.
维生素C高温时容易被破坏，所以不宜热锅爆炒蔬菜
C.
构成人体蛋白质的20多种氨基酸都能通过人体自身合成
D.
可用燃烧的方法鉴别真丝围巾和合成纤维围巾
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皮皮学刷刷变学霸
举一反三
【单选题】____ in the United States, St Louis has now become the 4 th largest city.
A.
It is the 24 th biggest city
B.
It was the 24 th biggest city
C.
Before the 24 th biggest city
D.
Once the 24 th biggest city
【单选题】London will be the 30th city _____ holds the Olympic Games. [ ]
A.
where
B.
that
C.
which
D.
what
【单选题】—Which do you like better, the country life or the city life? —_____. On weekdays I like living in the city, but I usually spend my weekends and holidays in the country. [ ]
A.
Sounds good
B.
I think so
C.
It's hard to say
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