In order to reinforce and test what the students have learned, _______is frequently used in the Direct MethoD.
A.dictation
B.test
C.quiz
D.examination

单项选择题在汛期，水库不得擅自在( )水位以上蓄水。

单项选择题______ is a description of the structure of a language and the way in which linguistic units such as words and phrases are combined to produce sentences in the languagE.A.lexiconB.syntaxC.grammarD.cohesion