下列关于单细胞生物的叙述中，错误的是（ ）
A．多分布在淡水、海水和潮湿的土壤中
B．都像草履虫一样，必须从周围环境中摄取有机养料
C．整个身体只由一个细胞构成
D．能独立完成营养、呼吸、排泄、运动和生殖等生命活动
A、单细胞生物广泛分布于淡水、海水和潮湿的土壤中，如细菌就属于单细胞生物，分布广泛，在土壤、水里、冰川、大海、沙漠中，岩石上、空气中乃至我们的身体内，都可以找到，到处都有细菌的存在．不符合题意．
B、单细胞生物个体的营养方式有自养也有异养，如衣藻是单细胞的植物，细胞内有叶绿体能进行光合作用制造有机物，是自养；草履虫是单细胞的动物，直接以浮游植物为食，是异养，符合题意．
C、单细胞生物只由单个细胞组成，故不符合题意．
D、单细胞生物虽然只由一个细胞构成，但也能完成营养、呼吸、排泄、运动、生殖和调节等生命活动．故不符合题意．
故选：B
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| Tom is a middle school student. He is studying in Grade 7. He usually 1 at 7:00 o'clock in the morning. 2 today he gets up at 6:30 and goes to buy a big cake. After that he helps his grandparents clean their room, because it is his 3 birthday. His grandpa is going to be 78 years old. Tom 4 two CDs about Beijing Opera (京剧) 5 his grandpa. He is sure his grandpa would like 6 very much, because his grandpa likes listening to Beijing Opera. When Tom 7 home at noon, his mother is making noodles with grandma. They are laughing and talking about something happily. His grandpa is drinking tea 8 listening to Beijing Opera. Tom says, "Happy birthday to you, grandpa." Then he cuts the big cake and gives grandpa a 9 piece. Grandpa is very happy and eats it. In the evening, Tom watches TV with his grandparents together. He is a little 10 but very happy, because he can make his grandparents happy. | ||||
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