In many countries, some scientists are already _______ research in order to produce a cloned human baby.

A．putting up with

B．coming up with

C．putting forward

D．pushing ahead with

（如图所示）这个符号的开关控制什么装置？（）

A．儿童安全锁

B．两侧车窗玻璃

C．电动车门

D．车门锁住开锁