按涉及被购并企业的范围划分，购并可分为______。
A. 整体购并和部分购并
B. 横向购并和纵向购并
C. 向后购并和向前购并
The passage tells readers that English people ______.
A. have never discussed who is the world's greatest poet and greatest dramatist
B. never discuss the world's great poets or dramatists
C. do not care who is the world's greatest poet and greatest dramatist.
D. are sure who is the world's greatest poet and greatest dramatist
既允许字段中出现重复值，又允许索引项中出现重复值的是( )。
A. 主索引
B. 候选索引
C. 惟一索引
D. 普通索引
It can be inferred(推断出)that the main idea of this passage is ______.
A. cooperation in sports
B. productive team
C. advantages of being in a team
D. effective teamwork
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