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【单选题】
关于碱性溶液，下列叙述正确的是A.
只存在OH-
B.
[OH-]>[H+]
C.
PH值<7
D.
PH=7
E.
[H+]>10-7
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反馈参考答案：
举一反三
【简答题】隧道可分为主体建筑物和 。
【单选题】—What beautiful shoes you're wearing! They must be expensive. —No. they only 10 yuan. [ ]
A.
spent
B.
took
C.
paid
D.
cost
【单选题】--What beautiful shoes you’re wearing! How much are they？ --They only __________ 10 yuan.
A.
spent
B.
took
C.
paid
D.
cost
【单选题】—What beautiful shoes you are wearing! They must be expensive.
A.
hey only ____ 40 yuan.
B.
spent
C.
takes
D.
cost
E.
paid
参考解析：
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