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【判断题】
PH值小于4.5的食品称为酸性食品。 ( )A.
正确
B.
错误
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举一反三
【单选题】His English is improving _______, which makes both his parents and his teacher happy.
A.
now and then
B.
little by little
C.
sooner or later
D.
one after another
【简答题】0胎儿血红蛋白是指
【单选题】He loves his parents deeply, ________ are very kind to him.
A.
both of them
B.
both of who
C.
whom
D.
both of whom
参考解析：
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