根据常识原则，哪一项可以最先排除？
A. He had only a third-grade education.
B. He once threated to kill his teacher.
C. He often helped his mother do housework.
D. He grew up in a poor single-parent family.
根据求同原则，以下哪些选项从涉及的方面来看是一致的？
A. Watch educational TV programs only.
B. Write two book reports a week.
C. Help with housework.（家务）
D. Keep a diary. （教育）
根据相关与相反原则，答案最有可能在哪些选项中？
A. It is used by more people than English.
B. It is more difficult to learn than English.
C. It will be as commonly used as English.
D. It will eventually become a world language.
根据相关与相反原则，答案最有可能在哪些选项中？
A. She is on duty.
B. She is having her day off.
C. She is on sick leave.
D. She is on abroad on business.
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