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【单选题】

Gender differences between boys and girls can be seen at an early age.

A.
classification by age
B.
classification by whether you are male or female
C.
classification by name
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参考答案:
参考解析:
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【多选题】a built environment 2. an ingrained behavior 3. a way to maintain a sense of privacy 4. an invasion of personal space 5. a non-territorial behavior

A.
making less eye contact
B.
a school
C.
refraining from touching a plate in a restaurant
D.
sitting next to someone
E.
preventing face-to-face invasion