皮皮学，免费搜题
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【判断题】
测量溶液的 pH 值常用的指示电极为玻璃电极,它属于第一类电极。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】Which of the following is NOT an advantage of a well-spaced set of twenty to twenty four teeth ?
A.
These teeth would work harder and become healthier.
B.
Decay of teeth could not develop.
C.
We would eat the diet of our ancestors.
D.
Teeth can be extracted easily during childhood.
【单选题】—How much is that T-shirt? —________. [ ]
A.
It's twenty yuan
B.
They are twenty dollar
C.
They are twenty dollars
D.
It's twenty dollar
【单选题】Her shoes _____ twenty dollars and his T-shirt _____ also twenty dollars. [ ]
A.
are;are
B.
are;is
C.
is; are
D.
be; is
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