驾驶车辆过度疲劳是指驾驶员每天驾驶机动车超过（）小时或从事其他体力劳动消耗过大或睡眠

Have you finished you work  ? Yes, I have finished it  . I finished it    1 hour ago.

A．already ,yet ,/

B．yet , already, /

C．yet ,yet, since

D．yet ,already, since

用所给词的适当形式填空

1. I have a ________busy week. (real)

2. Thanks for your ________to visit next week. (invite)

3. Today is Tom's ________ birthday. (fourteen)

4. My________ brother is two years ________than me. (old)

以下哪一项不是引起尿潴留的原因：（）

A．前列腺肥大

B．肾绞痛

C．膀胱肿瘤

D．直肠或盆腔手术

基因迁移

国有企业培养的人才，被（）等无偿占用的问题是外部性问题。

A.另一家国有企业

B.三资企业

C.外资企业

D.国内事业单位

E.私人企业