股骨干骨折牵引治疗时，从第几天起可练习股四头肌收缩及踝关节跖趾关节屈伸活动？（） A

—Where did you meet her for the first time?

—It was in the hotel ________ I was staying.[ ]

A. that  

B. when

C. where

D. which

心房颤动出现缓慢规整的心室律提示（）.

A.合并一度房室传导阻滞

B.合并二度Ⅱ型房室传导阻滞

C.合并三度房室传导阻滞

D.合并高度房室传导阻滞

E.干扰现象

It seems parents have long been right. Going to bed early is key to getting enough sleep and helping adolescents feel on top of the world, a new study reported.

A   1  of sleep among youngsters may    2  depression and suicidal (自杀的)thoughts, according to the study by the Columbia University Medical Center.

"Our results are   3  with the theory that inadequate sleep is a risk factor for depression, working with other   4  and protective factors through multiple possible causal pathways to the development of this   5  disorder," said lead author James Gangwisch.

"  6  quality sleep could therefore be a preventative measure against   7  and a treatment for depression," he added in the study   8  in the Friday issue of Sleep magazine.

The study followed the nightly habits of some 15,659 college and high-school students, and   9  those who consistently went to bed   10  midnight had a 24 percent higher risk of depression than those who turned in before 10:00 pm.

Night owls（夜猫子）also ran a 20 percent   11  risk of battling suicidal thoughts, the study added.

The American Academy of Sleep Medicine   12  that adolescents should sleep at least nine hours or more a night. Those who were tucked in before 10:00 pm reported they slept    13  about eight hours and 10 minutes.

But that amount of sleep  14  significantly for those in bed after midnight.

And adolescents who slept five hours or less a night were 71 percent more   15  to suffer depression and 48 percent more     16  becoming suicidal, the study said.

"It is a common perception and societal   17  that adolescents do not need as much sleep as pre-adolescents, yet studies suggest that adolescents may  18  require more sleep," said Gangwisch.

"Studies have found that adolescents do not go to bed   19  enough to make up for earlier school start times, and transitions to earlier school start times have been shown to be   20  with significant sleep deprivation（剥夺）. "

(    ) 1. A. night                B. moderation       C. limit                D. lack

(    ) 2. A. result in           B. lie in                C. come about       D. bring in

(    ) 3. A. opposed           B. mixed              C. related              D. consistent

(    ) 4. A. risk                  B. chance              C. potential           D. reason

(    ) 5. A. mood                      B. body                C. feeling             D. mind

(    ) 6. A. little                B. lack                 C. Adequate          D. over

(    ) 7. A. suffering          B. depression               C. disorder            D. sadness

(    ) 8. A. reported           B. published          C. reflected           D. noted

(    ) 9. A. found                      B. investigated      C. appraised          D. supported

(    ) 10. A. before            B. from                C. by                    D. after

(    ) 11. A. lower             B. higher              C. more                D. less

(    ) 12. A. appeals           B. recommends     C. calls                 D. plans

(    ) 13. A. on average      B. in place            C. ahead of           D. in number

(    ) 14. A. increased               B. disappeared       C. strengthened     D. dropped

(    ) 15. A. likely             B. probable           C. possible            D. perhaps

(    ) 16. A. at sight of       B. at risk of          C. in front of               D. as a result of

(    ) 17. A. wish               B. expectation       C. suggestion               D. attempt

(   ) 18. A. exactly           B. immediately      C. directly            D. actually

(    ) 19. A. early              B. lately                      C. soon                 D. quickly

(    ) 20. A. separated               B. associated         C. divided             D. depended

定期维护与故障维护两种方法各有优缺点，（）不是定期维护的优点。

A、可以使设备的寿命达到最大化

B、可以使运转中断的次数最小化

C、需要的维护人员数量最少

D、能够提前预防故障的发生

在《自然辩证法》一文中，恩格斯指出，文艺复兴驱散了“中世纪的睦灵”，推动了人们的思想解放，“是一次人类从来没有经历过的最伟大的、进步的变革”。西方学者在论及文艺复兴的意义时，普遍将它作为西方社会近代化的开端。这就是说（）

A.哲学思想的变化是社会变革的先导

B.社会变革推动了人类思想的解放

C.现代化发端和发达于欧洲是人类历史的必然

D.哲学革命是西方资本主义经济发展的推动力