题干
-- Can a camel swim?
--
A：No, fish swim.
B：Yes, it can.
C：No, a tiger has stripes.
D：No, the lion big.
答案(点此获取答案解析）
B
-- Can a camel swim?
--
A：No, fish swim.
B：Yes, it can.
C：No, a tiger has stripes.
D：No, the lion big.
后，将原生质体转移到适当的培养基上培养，使原生质体再生出细胞壁，这时，在细胞混合物中，可用显微镜观察到的细胞有（ ）
②烟草细胞 ③大豆细胞 