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问题 单项选择题

癌细胞是不受机体控制、连续分裂的恶性增殖细胞。下列有关描述中，正确的是（）

A.酶的活性降低

B.具有丰富的游离的核糖体

C.细胞的呼吸速度减慢

D.是凋亡的机体细胞

答案

参考答案：B

阅读理解

读下面短文，画出家谱图 

    This is my friend John Wilson and his family. This is his grandfather. His name is Fritz. This is his grandmother. Her name is Evelyn. This is his mother. Her name is Anna. This is his father. His name is Earl. Earl’s parents are Fristz and Evelyn. These are his sisters, Christie and Carina.

 1. ______2. ______3. ______4. ______
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填空题

DMA是一种不需要______干预，也不需要软件介入的高速数据传送方式。
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