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问题 选择题

下列有关细胞生命现象的叙述中，不正确的是[ ]

A．手指发育过程中，指间细胞的自动死亡

B．红细胞寿命只有120天左右，红细胞的自我更新速度快

C．被病原体感染的细胞被清除

D．细胞死亡是细胞癌变的结果

答案

答案：D

阅读理解

阅读理解，判断正(√ )误(×)。

      Look at my family photo. This is my father. He's a teacher. He's tall. He likes sports. This is my mother.

She's a teacher, too. She likes reading. This is my brother. He's a baseball player. He's strong. I love my family.

( ) 1. My parents are teachers.

( ) 2. My father likes sports.

( ) 3. My brother likes music.

( ) 4. My brother is tall and strong.

( ) 5. There are four people in my family.
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单项选择题

直航船操一定舵角后，其加速旋回阶段的（）

A.横移速度为变量，横移加速度为常量

B.横移速度为常量，横移加速度为变量

C.横移速度为变量，横移加速度为变量

D.横移速度为变量，横移加速度为常量
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