问题 阅读理解

The manager and staff are happy to welcome you and will do all they can to make your stay an enjoyable one.

MEAL TIMES

Our overnight charge includes a continental-type breakfast.

Breakfast: 7:30—9:30 a.m.

Lunch: 12:00—2:00 p.m.

Afternoon tea: 4:00—5:30 p.m.

Dinner: 7:00—9:15 p.m.

Meals can be served in rooms at a small extra charge. We regret that meals can not be served outside these times.

Light refreshments(茶点) including tea, coffee, biscuits and sandwiches can be served in rooms between 10:00 a.m. and 11:00 p.m. except during the meal times listed above. Cold drinks are available in the room refrigerator.

ROOM CLEANING

Please hang the sign on your door handle if you do not wish to be disturbed. It will be easier for the maids if you can leave the room temporarily(暂时地) at any time between 9:00 a.m. and 4:00 p.m.

VALUABLES

We are not responsible for the loss of money, jewels, or other valuables unless they are kept in the safe and signed for by the manager.

DEPARTURES

Please inform receptionists(接待员) of your intended leaving before 9:30 a.m. of the day concerned and leave the room by noon to allow for its preparation for incoming guests. If necessary, luggage can be left in the charge of the hall porter(搬运工人).

A SPECIAL REQUEST

We would respectfully suggest that in consideration of the comfort of other guests, the volume of radios and televisions should be turned down after 11:00 p.m. .

72.Meals can be served __________ .

A. in rooms at 9:00 p.m.                    

B. in the dining room from 7:30 a.m. to 9:15 p.m.

C. in the dining room at 6:00 p.m.      

D. outside the room at 3:00 p.m.

73.If you intend to leave the room tomorrow, you may leave at any of the following hours EXCEPT _________.        .

A. 10:00 a.m.   B. 12:00 a.m.            C. 3:00 p.m.          D. 11:00 a.m.

74.Which of the following statements is NOT true?

A. Cold drinks can be found in the room refrigerator.

B. Guests are requested to turn down their radios and televisions after 11:00 p.m.

C. The sign that can be hung on the door handle shows that the room needs to be cleaned.

D. Your luggage can be kept by the hall porter.

75.Where is this notice most likely to be found?

A. In hotels                       B. In the newspapers     

C. At restaurants                  D. In shops

答案

小题1:A

小题2:C

小题3:C

小题4:A

         

实验题

(16分)铝镁合金已成为轮船制造、化工生产等行业的重要材料。研究性学习小组的三位同学,为测定某含镁3%-5%的铝镁合金(不含其它元素)中镁的质量分数,设计下 * * 种不同实验方案进行探究。填写下列空白(可能用到的相对原子质量:Al-27)

[探究一] 实验方案:铝镁合金测定剩余固体质量。

实验步骤:

(1)称取5.4g铝镁合金粉末样品,投入VmL 2.0mol·L1NaOH溶液中,充分反应。NaOH溶液的体积V≥               

(2)过滤、洗涤、干燥、称量固体。该步骤中若未洗涤固体,测得镁的质量分数将  

                   (“偏高”或“偏低”)

[探究二] 实验方案:铝镁合金测定生成气体的体积(实验装置如下图)

问题讨论:

为使测定结果尽可能精确,实验中应注意的

问题是(写出可能的一点):               

                                         

[探究三] 实验方案:称量m g铝镁合金粉末.放在如右图所示装置的惰性电热板上,通电使其充分灼烧。

问题讨论:欲计算Mg的质量分数,该实验中还需测定的

数据是                                            

[实验拓展] 请你另设计一个实验方案,测定该铝镁合金中镁的质量分数(书写形式可以模仿探究一、二实验方案)

                                                                             

判断题