确定性变量是指受偶然性因素的作用，变量值呈现出随机的混沌状态变动的变量。（）

男，70岁，1年前有脑卒中史，体检发现患者双侧额纹对称，右侧鼻唇沟变浅，伸舌舌尖偏向右侧，右上肢肢体在床面上能水平移动，但不能抬离床面，右下肢肢体能抬离床面，但不能抗阻力。

右下肢肢体能抬离床面，但不能抗阻力提示（）。

A.肌力0级

B.肌力1级

C.肌力2级

D.肌力3级

E.肌力4级

谵妄的病理机制主要是脑神经细胞急性代谢紊乱。（）

Americans like to travel on their yearly holiday.Today，more and more travelers in the United States are spending nights at small houses or inns （客栈） instead of hotels.They get a room for the night and the breakfast the next morning.

Rooms for the night in private homes with breakfast have been popular with travelers in Europe for many years.In the past five to ten years，these bed-and-breakfast places have become popular in the United States.Many of these America’s bed-and-breakfast inns have only a few rooms,others are much larger.Some inns do not provide telephones or televisions in the rooms，others do.

Staying at a bed-and-breakfast inn is much different from staying at a hotel.Usually the cost is much less.Staying at an inn is almost like visiting someone’s home.The owners are glad to tell about the areas and the interesting places to visit.Many vacationers say that they enjoy the chance to meet local families.

小题1:68.Americans take a holiday trip _____.

A．all the year round

B．for years

C．every year

D．every other year小题2:69.Staying at the bed-and-breakfast inns,_______.

A．the travelers needn’t pay anything

B．the travelers don’t have to pay for the telephone or television

C．the travelers can meet and talk with the local people

D．the owners will show the travelers around the area小题3:70. Which if TRUE according to the passage?

A．European and American vacationers like staying at bed-and-breakfast inns.

B．All Ameicans enjoy traveling

C．These bed-and-breakfast inns are all old historic buildings

D．Staying at a bed-and-breakfast inns is just like at the traveler’s home

增加光合面积，主要是提高有效的（）

A.根冠比

B.叶面积指数

C.光合时间

D.叶片数量

根据《建筑起重机械安全监督管理规定》建设部令第166号第十八条，使用单位应当履行（）安全职责。

A.根据不同施工阶段、周围环境以及季节、气候的变化，对建筑起重机械采取相应的安全防护措施

B.制定建筑起重机械生产安全事故应急救援预案

C.设置相应的设备管理机构或者配备兼职的设备管理人员

D.指定专职设备管理人员、兼职安全生产管理人员进行现场监督检查