Read and write.

1.                         ?

    I'm very well, thank you.

2.                          ?

    I am thirteen years old.

3.                         ?

     I am 156 cm tall.

4.                        ?

     I am 42 kg.

5. ____________?

    I wear size 38.

6.                         ?

    My legs are 78 cm long.

测定汽油机速度特性曲线时，节气门开度应（）

A.不变

B.增大

C.减小

D.以上都不是