大火已被抑制或燃烧已被控制的情况下，经常采用()控制烟气。A．浮力 B．加压控制 C

Today’s lecture is about the mass (1) of the world’s population. There are two major (2) why people are moving to cities. The first reason is (3) . People are moving to the cities because that’s where they can find (4) and earn money. The second reason for the move to cities has to do with (5) of life issues: comfort and (6) . Cities often offer better (7) . And then for many, city life is just more (8) . An interesting consequence of urbanization is that the average (9) of people in the countryside is increasing, while that of the cities is (10) .
Three key (11) can be identified in our cities. First of all, they’re getting bigger. Most cities are bigger now than ever before. Cities are also changing shape. They’re getting (12) , because land is getting more and more expensive. (13) have become a symbol of modern cities.
Cities are also changing shape in other ways. The (14) Model and the (15) Nuclei Model are probably more typical of the cities we know today. They show the urban (16) that’s occurring in contemporary cities.
The third change is that our cities are breaking up into (17) communities, often by (18) group or (19) level. This often means that people stay within their community and do not come into contact with others from different (20) .

学习了溶液的概念后，老师的提问及同学的回答如图所示：

（1）以上三位同学中能够正确描述溶液特征的是______同学．

老师接着问：“你们还想知道什么？”

王华回答：“影响物质在水中溶解能力的因素有哪些？”

（2）针对王华的问题，老师引导同学们进行了一系列探究，下表列出了从探究实验中获取的部分数据，请你根据这些下表中的数据，在右边的坐标图中绘制A、B两物质的溶解度曲线（图中注明A、B）． 

温度/゜C		0	20	40	60
溶解度/g	A物质	30	35	41	50
	B物质	25	35	55	90

（3）该实验主要探究了温度对固体物质溶解度的影响，在一定温度范围内，A物质的饱和溶液溶质质量分数大于B物质的饱和溶液溶质质量分数，该温度范围是______．

（4）将在20゜C时等量的A、B饱和溶液同时降温到10゜C，则析出晶体的质量A______B（填“大于”、“等于”或“小于”）．

（5）在20゜C时，向100g水中加入40gA物质充分溶解后，形成的A物质溶液质量是

______g．

有如下一个Sub过程：
Sub mlt (ParamArray numbers())
n=1
For Each x In numbers
n=n * x
Next x
Print n
End Sub
在一个事件过程中如下调用该Sub过程：
Private Sub Coinmand1_Click()
Dim a As Integer
Dim b As Integer
Dim c As Integer
Dim d As Integer
a=1
b=2
c=3
d=4
mlt a，b，c，d
End Sub
则运行该程序，结果为______。

A) 12
B) 24
C) 36
D) 48

已知数组arr的定义如下：
int arr[5]=1，2，3，4，5；
下列语句中输出结果不是2的是( )。

A．cout＜＜*arr+1＜＜end1；

B．cout＜＜*(art+1)＜＜end1；

C．cout＜＜arr[1]＜＜end1；

D．cout＜＜*arr＜＜end1；

烟煤挥发分含量比无烟煤高，在高炉风口区内燃烧的效率（）。

A.要低

B.要高

C.与无烟煤一样