酒后驾车而发生重大车祸，造成伤亡事件，其主要原因是[ ]

A．发生了慢性的酒精中毒

B．酒精增加了肝脏负担

C．酒精使心肝血管受损

D．酒精影响了大脑的控制能力，导致行为失控

During the last few years, it has been realized that maintenance of programs is more expensive than development, so reading of programs by humans is as important as (67) them.

A．editing

B．writed

C．written

D．writing