The city has a population of over 30 million，most of them（）in the countryside.

An inadequate knowledge of grammar would severely const...

判断题An inadequate knowledge of grammar would severely constrain one’s capacity for effective communication.（）

titanic（）A.limitedB.powerfulC.timidD.panic

单项选择题titanic（）

precarious（）A.unsafeB.cautiousC.preoccupyD.steady

单项选择题precarious（）