【单选题】
The atmosphere _______ certain gases mixed together in definite proportions.
①
composes of
②
is made up
③
consists of
④
makes up of
【单选题】
Which of the following statement is not true?
①
Grammatical competence is essential for communication
②
There is a positive role of instruction for grammar learning
③
Grammar teaching can enhance learner proficiency
④
Grammar learning is completely useless for children.