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【单选题】

Haven’t you enough common ________ to know that it is unwise to go outside in such a hazy (雾霾的) day? You may get lost.

A.
practice
B.
sense
C.
rule
D.
goal.
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参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【单选题】下列关于硅酸的叙述,错误的是 [ ]

A.
硅酸是一种很弱的酸
B.
硅酸可由二氧化硅与水反应制得
C.
硅酸不稳定,加热脱水会生成二氧化硅
D.
硅酸可以由可溶性硅酸盐与盐酸反应制得