奇数个“1”相异或结果为：（ ）偶数个“0”相同或结果为：（ ）
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How would you describe someone who is 22 years old.(Choose all correct answers)
A. She's in her early twenties.
B. She's a young adult.
C. She's in her twenties.
D. She's middle-aged.
In Western cultures, it is ok to ask children about their ages.
A. 对
B. 错
Match the family vocabulary words with the correct definitions.
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