下列对学习压力和考试焦虑的理解不正确的是（ ）
A：学习活动不可能没有压力
B：考试焦虑有利于考试水平的发挥
C：适度的学习压力有利于提高学习效率
D：要将考试焦虑维持在适度的水平上
This book is very interesting and I'll finish it soon.
我国的政权组织形式是民主集中制。（ ）
- How long does it take to get to the airport?
- Forty minutes. But it's foggy today. I'm not sure _________ the highway will be closed soon. Let's set off earlier.
