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【判断题】
I ( v + △ v + m / x )可以与第二部类有关部分进行交换。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】— I dropped in at your house at about ten last night, but you weren't in. — I ______ regular exercises at the club. [ ]
A.
did
B.
was doing
C.
had done
D.
have been doing
【简答题】胸腺是[填空（1）]细胞成熟的场所
【单选题】— You were out when I dropped in at your house. — Oh, I _____ for a friend from England at the airport. [ ]
A.
was waiting
B.
have waited
C.
am waiting
D.
had waited
【简答题】胸腺是 细胞分化,发育和成熟的场所。
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