A.They are playing in the park.
B.The woman is asking the way to the park.
C.The man is seeing the woman off.
D.They are going to visit the park.
第8题
Rh血型系统中抗原性最强的抗原是()。
A.C抗原
B.c抗原
C.D抗原
D.d抗原
E.E抗原
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