50________.

【名词&注释】

浓硫酸(concentrated sulfuric acid)、石灰水(limewater)

[单选题]50________.

A. keep
B. make
C. let
D. protect

查看答案&解析查看所有试题

学习资料：

[单选题]Tommisunderstoodhisclassatfirstbecause

A. hedidnotknowmuchaboutIndianculture
B. hedidn'texplaineverythingclearlyenough
C. somestudentsdidn'tunderstandhisquestions
D. hedidn'tknowwherethestudentscamefrom

[单选题]．下列物质露置于空气中，质量不变的是

A. 石灰水
B. 氧化钠
C. 浓盐酸
D. 浓硫酸

[单选题]7． —_________won the 100th gold at the Olympics for China?—Zhang Yining． She’ s from Beijing．

A. Who
B. What
C. When
D. Where

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