Usually a lesson should focus on practicing one single skill so that the students can develop that skill successfully.（）

A normal lesson should have the all the stages discusse...

判断题A normal lesson should have the all the stages discussed in this unit and the stages should be in fixed order.（）

One function of a language can only be expressed by one...

判断题One function of a language can only be expressed by one structure.（）

The natural order hypothesis is presumed by Krashen to ...

判断题The natural order hypothesis is presumed by Krashen to be the result of the learned system, operating free of conscious grammar.（）