单项选择题

I have a brother and a sister. They are （） living in Australia.

A. all
B. both
C. either

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单项选择题
Which book is （） difficult, this one or that one.

A. much
B. least
C. less
单项选择题
My mother has three brothers. All are （） than she. Jack, （）, is a doctor.

A. elder; the eldest
B. older; the oldest
C. elder; the old one
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