助癌物

阅读下面短文，选择正确答案。

      Zhang Peng has a pen pal. His name is John. John goes to school on foot, and John's mother is a doctor.

John's father is a teacher. They live next to a hospital. John's favourite food is noodles, and his favourite colour

is red. Zhang Peng knows a lot about his pen friend.

1. How does John go to school?  He goes to school ____________.

A. on foot

B. by bike

C. by subway

2. What does John's father do?  He is a ____________.

A. teacher

B. doctor

C. policeman

3. Where do they live?  They live next to a ____________.

A. cinema

B. hospital

C. library

4. John's favourite food is ____________.

A. rice

B. dumplings

C. noodles

5. John's favourite colour is ____________.

A. red

B. blue

C. white

6. Does Zhang Peng know a lot about John's pen friend? 

A. Yes, he does.

B. No, he doesn't.

C. I don't know.

“五一”小长假的第一天，张奶奶在买菜回家的路上突发心脏病，倒在路边不省人事。育仁中学的王强和李明两名学生发现后赶紧拨打120，并且一直守候到救护车来后才默默离开。张奶奶因为得到及时抢救现已无生命危险，事后她的女儿叶扬多方打听得知是王强和李明同学出手相助，十分感激。请你以张奶奶女儿的名义给王强和李明写一段表示感谢的话语。（要求写明感谢的内容，表达感谢的心意，语言准确得体，不超过200字）

从热能和还原剂利用角度分析，用以表示高炉冶炼能量利用的指标有（）、（）、（）的发展程度。

从天线接收到的高频回波信号通过收发开关送到接收机保护器，再经过高频放大后送到检波器进行检波。