每种传感器都有优缺点，无法用单一传感器完成环境感知任务。
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学校的学习需要处理好现实任务环境和模拟任务环境间的合理关系，最重要的是区分（）之间的差异。
A. 心理逼真度
B. 物理逼真度
C. 功能逼真度
D. 任务逼真度
As he _____ the newspaper, Grandpa ____ asleep.
A. read, was falling
B. was reading, fell
C. was reading, was falling
D. read, fell
The environment of our country is already good and it _____ even better.
A. had got
B. got
C. has got
D. is getting
You_______ TV. Why not do something more meaningful now?
A. always watch
B. always watched
C. have always watched
D. have always been watching
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