At the World Literacy Center, an organization that works to help people read, the helpers work hard, enabling them to successfully reach their goals.

A．assistants

B．volunteers

C．part-timers

D．amateurs

关于汽油喷射方式，甲技师说：同时喷射时，曲轴每转两转各缸喷油器同时喷射两次；乙技师说：顺序喷射的各缸喷油器喷射顺序与点火顺序相同。你认为（）。

A、仅甲正确

B、仅乙正确

C、甲和乙都正确

D、甲和乙都不正确