客户至少在( )前通知工程咨询单位全部或部分暂停服务或中止协议书。工程咨询单位即应安排停止服务,将开支减至最小。
A.30天
B.42天
C.49天
D.56天
参考答案:D
Americans eat_____vegetables per person today as they did in 1910.
A.more than twice
B.as twice as many
C.twice as many as
D.more than twice as many
本能论认为,人类行为源于()
A.爱的本能
B.遗传本能
C.生的本能
D.死的本能
E.生的本能和死的本能