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【多选题】
15【多选】对阿司匹林进行滴定时,采用中性乙醇为溶剂,是因为A.
非水滴定不允许使用水
B.
防止阿司匹林在滴定过程中酯键水解
C.
市售乙醇对酚酞显微酸性，应用氢氧化钠中和后使用
D.
阿司匹林在乙醇中溶解度更高
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【单选题】Thousands of years ago people discovered the phenomenon by chance, and this was _____ the idea of the compass first came from.
A.
how
B.
what
C.
where
D.
that
【简答题】A．One hundred years ago. B．Two hundred years ago. C．Hundreds of years ago. D．Thousands of years ago.
【简答题】Read the passage. Match each paragraph with the information it contains.
【单选题】China's history is more than 5 _________ years old. [ ]
A.
thousands of
B.
thousand of
C.
thousands
D.
thousand
【简答题】Read the Passage. Match each paragraph with the information it contains.
【简答题】• 普罗泰戈拉 提出了“ ”的著名命题,认为事物的存在是相对于人的感觉而言的,人的感觉怎样,事物就是怎样。 这一命题不是说人决定着万物的存在或不存在,而是说人的认识决定存在着的事物为什么是这样而不是那样。
【单选题】The lack of ( ) from thousands of years of settlement and clear-cutting prompted the development of stir-frying.
A.
harvest
B.
cooking ingredients
C.
cookers
D.
cooking fuel
【简答题】Match each paragraph with the corresponding measure it describes to clean the lathe.
【简答题】Read the passage and match each paragraph with the corresponding aspect of the company.
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