基本偏差用来确定公差带相对于零线位置的上极限偏差或下极限偏差，一般是指靠近零线的那个偏差。a～h的基本偏

A. It used English as the language.
B. It cant satisfy different audiences tastes.
C. Its budget was not enough.
D. It used a Mexican actress.

A. Early humans should have communication in tracking game.
B. Language can enable humans to compete with other top predators.
C. Animals should understand the orders given by humans.
D. Language could give a rapid and bizarre switch for any animal.

A. It is less serious in cities than in rural areas.
B. It affects both junior and senior high schools.
C. It results from a worsening economic climate.
D. It is a new challenge facing American educators.