如果水泵流量不变，管道截面积减少，则流速（）。A.增加 B.减少 C.不变 D.无关

为了奖励那些经常乘坐本公司航班的乘客，大北亚航空公司每年都向这部分乘客赠送礼券，凭一张礼券可兑换大北亚航空公司机票一张。这样的机票自然不办理退票。一家商贸公司计划组织人力，专门收购这样的礼券，再以低于相应的机票标准价出售从中牟利。
为了避免上述商贸公司在实施其计划后可能给大北亚公司带来的经济损失，以下哪项最可能是大北亚公司所采取的措施

A．提高赠送礼券的标准，从而减少所要赠送的礼券的数量。

B．缩短由礼券所兑换的机票的期限。

C．缩短由礼券所兑换的机票的有效期限。

D．限制由礼券所兑换的机票之使用者的身份。

E．限制由礼券所兑换的机票的有效航线。

楼道里，夜间只是偶尔有人经过，电灯总是亮着会浪费电能。科研人员利用光敏材料制成“光控开关”，天黑时自动闭合；天亮时自动断开。利用声敏材料制成“声控开关”，当有声音时，自动闭合，无声音时自动断开。若将这两个开关配合使用，就可以使楼道灯变得“智能化”，使电灯只有在夜晚天黑之后，有人走过时才能亮。请在图中用笔画线连接好电灯的工作电路图。

Ice Hotel Quebec, located 30 minutes west of Downtown Quebec City, Canada, is only open during the winter season. The hotel is made entirely of ice. The two galleries at the Ice Hotel Quebec feature events such as ice painting and ice sculpture(冰雕) competitions.

Things to Do

Guests have a choice of different winter vacation activities, including cross-country skiing, ice skating, dog sledding (狗拉雪橇)， ice fishing and sliding(滑行). Ice Hotel Quebec has a sauna( 桑拿浴)，so remember to pack your bathing suit.

Rooms & Suites(套房)

The hotel offers 18 rooms and 14 theme suites built from 12,000 tons of snow and 400 tons of ice. The walls at Ice Hotel Quebec are four feet thick and allow the hotel to keep a temperature of -2℃ to -5℃.

The furniture at the hotel is made of snow and ice, including the beds. The beds are equipped with a thick foam mattress(泡沫床垫)and an extra thick sleeping bag. That is enough to prevent you from catching a cold.

Vacation Tip

Ice Hotel Quebec offers 30-minute guided public tours daily from 10:30am to 4:30pm. It costs $15 CAD for adults, $7.5 for children (under eight), $13for students\seniors (above sixty), and $42 for families.

Plan This Vacation

Ice Hotel Quebec-Canada will be open for its sixth season from January 5^th to April 1^st. Costs for overnight stays start at $199CAD per person.

If you’re looking for something really different to do on your next trip, think creatively and plan to visit the truly unusual Ice Hotel Quebec!

小题1:If you visit the Ice Hotel, you can enjoy the following EXCEPT___________.

A．going fishing

B．going skating

C．appreciating ice sculptures

D．holding an ice party小题2:Sleeping is not a problem in the Ice Hotel because ____________.

A．the rooms are made of ice

B．the temperature is as high as -2℃

C．the sleeping bags are warm

D．the walls are four feet thick小题3:If Mr. Smith attends a 30-minute public tour with his wife and seven-year-old twin sons, he should pay at least_________.

A．$37.5 CAD

B．$45 CAD

C．$42CAD

D．$199 CAD

13世纪，经院哲学达到鼎盛时期，出现了一批伟大的经院哲学家。其中其思想被教会确立为正统者终身学习的理论体系的是（）

A、托马斯-阿奎那

B、奥古斯丁

C、德尔图良

D、黑格尔

TBA/22灌装机水系统中水的作用有（）

A、冷却作用

B、密封作用

C、清洗作用

D、溶解作用

E、稀释作用

F、润滑作用、加热介质