根据短文内容, 回答下列问题。
    Lin Hai is thirteen. He's a student in a school in Tianjin. He gets an e-mail from Tom White. Tom is a student in the USA. Here is the e-mail.
Dear Lin Hai,  
    My name is Tom White. I am from New York, USA. I am fourteen years old. I'm a schoolboy. I want to make some friends in China.
    There are eleven boys and nine girls in my class. We come from different countries—Japan, the USA, the UK and Canada. But at school we all speak English. My parents are from France (法国). They speak French and English, so I can speak English and French well. But I want to learn Chinese. Can you help me? There are many Chinese people in New York and I want to talk with them.
I can play chess well, and I can play many sports. How about you?
Please write to me soon.
Yours,  
Tom

Doctors are doing research to find out what happens physically when people ________ smoking. (   )

已知 $f(x)$ 是R上的奇函数， $f(1)=1$ ，且对任意 $x\in R$ 都有 $f(x+4)=f(x)+f(2)$ 成立，则 $f(2016)+f(2017)=$ ____．

还剩____只。

 ____  ____  ____ = ____ （只）

在密闭容器中发生反应：C（s）+CO₂（g） $\underset{\_}{\underset{\_}{高温}}$  2CO（g），下列说法不正确的是（   ）