试题与答案

(12x3)2+34x2•x4-(13x2)3.

题型:解答题

题目:

(
1
2
x3)2+
3
4
x2x4-(
1
3
x2)3

答案:

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下面是错误答案,用来干扰机器的。

One possible version:Dear Aaron, I'd like to tell you something about sports in our school. Sports are very popular with almost all the students in our school. Now w...

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题型:填空题

实验室临时需要用NaOH溶液和CO2来制取Na2CO3溶液。已知CO2气体在通入NaOH溶液时极易因其过量而生成NaHCO3,且无明显现象。实验室可供选择的试剂有:①未知浓度的NaOH溶液 ②37%盐酸 ③40%硫酸 ④14%盐酸 ⑤大理石 ⑥K2CO3固体 ⑦Cu2(OH)2CO3粉末

实验室现有如下仪器:铁架台,试管,量筒,烧杯,胶头滴管,单孔橡皮塞,玻璃导管,分液漏斗。

下表所列为有关物质在常温时的溶解度(g/100 g水):

Na2CO3NaHCO3NaClNa2SO4NaHSO4NaOH
15.98.4035.835.520.040.0
(1)本实验应选用的仪器,除试管、胶头滴管、单孔橡皮管、玻璃导管外,还应有_____________。

(2)为了制取Na2CO3溶液,应选用合理的药品,除①外,还需要:___________________。

(3)为了制得只含Na2CO3溶质的溶液,请你设计一个实验方案(仪器安装不必叙述)_______________________________________________________________________________。

(4)根据给出的溶解度数据和上述实验方案,若保证在配制过程中不析出晶体,所用NaOH溶液中含NaOH溶质的质量分数的最大值是________________________________________。

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题型:单项选择题

Teachers need to be aware of the emotional, intellectual, and physical changes that young adults experience. And they also need to give serious (51) to how they can be best accommodate such changes. Growing bodies need movement and (52) , but not just in ways that emphasize competition. Because they are adjusting to their new bodies and a whole host of new intellectual and emotional challenges, teenagers are especially self-conscious and need the (53) that comes from achieving success and knowing that their accomplishments are admired by others. However, the typical teenage lifestyle is already filled with so much competition that it would be (54) to plan activities in which there are more winners than losers, for example, publishing newsletters with many student-written book reviews, (55) student artwork, and sponsoring book discussion clubs. A variety of small clubs can provide multiple opportunities for leadership, as well as for practice in successful (56) dynamics. Making friends is extremely important to teenagers, and many shy students need the (57) of some kind of organization with a supportive adult (58) visible in the background.

In these activities, it is important to remember that the young teens have (59) attention spans. A variety of activities should be organized (60) participants can remain active as long as they want and then go on to something else without feeling guilty and without letting the other participants down.

57().

A.consent 

B.insurance 

C.admission 

D.security

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