3. Mother’s Day is celebrated in a number of nations, but the date on which they fall differs from one nation to another.

　　(A) on which they fall differs

　　(B) on which it falls differs

　　(C) which it falls on differing

　　(D) on which they fall is different

　　(E) which they fall on being different

　　答案：B

　　类型：代词

　　解析：发出fall这个动词的主语应该是Mother’s Day，不能用they来指代，因此可以排除ADE选项。C选项中differing不能做主句的谓语动词，因此C错误。

　　4. A self-taught artist, the pottery of Lucy M. Lewis has been featured in many museums, including the Smithsonian Institution and the National Museum of the American Indian.

　　(A) A self-taught artist, the pottery of Lucy M. Lewis has been featured

　　(B) A self-taught artist, they featured the pottery of Lucy M. Lewis

　　(C) A self-taught artist, Lucy M. Lewis’ pottery has been featured

　　(D) The pottery of Lucy M. Lewis, a self-taught artist who has been featured

　　(E) The pottery of Lucy M. Lewis, a self-taught artist, has been featured

　　答案：E

　　类型：同位语

　　解析：A self-taught artist在句中充当同位语的角色，同位语必须和它挨着的部分是同一个事物，这里的A self-taught artist肯定是一个人。因此，我们可以排除ABC选项。D选项没有谓语动词，has是who has…这个从句的动词。综上选E。