I was 8 years old when my father was 31. this year my father is twice my age. How old am I?
A.
21
B.
22
C.
23
D.
24
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参考答案:
举一反三
【判断题】The main result of tissue ventilation is the change of gas composition in the cytoplasm of tissue, that is, oxygen is supplied to the cytoplasm and carbon dioxide is discharged.