单项选择题

Questions 19 to 21 are bused on the conversation you have just heard.

A. Foster families of adopted children.
B. Only the woman and her twin sister.
C. Several twins in adoption agency.
D. Adopted children’s birth parents.

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单项选择题
A. Because they prevent the bacteria from overgenerating. B. Because they can keep your hands clean. C. Because they let other bacteria move in. D. Because they can help cure some disease.
A. Because they prevent the bacteria from overgenerating.
B. Because they can keep your hands clean.
C. Because they let other bacteria move in.
D. Because they can help cure some disease.
单项选择题
A. The policy said that twins must be adopted separately. B. The adopting family only wanted to accept one child. C. Their birth mother asked for separate adoption. D. Some researchers were studying on them.
A. The policy said that twins must be adopted separately.
B. The adopting family only wanted to accept one child.
C. Their birth mother asked for separate adoption.
D. Some researchers were studying on them.
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