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问题 单项选择题

右图示某病毒侵入机体后被杀伤过程，相关说法正确的是（）

A.①是第二道防线中的杀菌物质抗体

B.①是效应T细胞，能使靶细胞裂解

C.可提高①杀伤力的淋巴因子来源于记忆细胞

D.靶细胞裂解的同时病毒被溶解消灭

答案

参考答案：B

选择题

关于动物在生物圈中作用的叙述，下列错误的是 [ ]

A．动物必须直接或间接地以绿色植物为食

B．动物是食物链中不可缺少的组成部分

C．动物能够适应环境

D．动物不能够影响环境和改变环境

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填空题

用所给单词的适当形式填空。

1. It is __________ (possible) for me to finish the work today. I need another day to do it.

2. This is our new classroom __________ (build). There are eighteen classrooms in it.

3. The famous __________ (science) Qian Suesen died of illness on October 31, 2009.

4. I __________ (think) he could come to my party, but now I know I was wrong.

5. No one taught me. I learnt it all by __________ (my).

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