初学徒手绘图时，应在方格纸上进行，以便（）和借助方格线确定图形的比例。
A、每格一字计数方便
B、每行一线制表方便
C、训练图线画的平直
D、训练字体写的清晰
在平面直角坐标系中,先将直线y=3x-2关于x轴作轴对称变换,再将所得直线关于y轴作轴对称变换,则经两次变换后所得直线的表达式是().
(A)y=2x-3
(B)y=3x-2
(C)y=2x+3
(D)y=3x+2
在地形图上量算曲线图形面积，根据要求可采用：()。
A、透明方格纸法、平行线法、电子求积仪法
B、透明方格纸法、几何图形法、电子求积仪法
C、透明方格纸法、平行线法、几何图形法
D、平行线法、几何图形法、电子求积仪法
Passage1
Questions 1 to 5 are based on the followingpassage.
I have come for a visit to an elementary classroomfor six- to nine-year-olds. Mystrongest impressionof this classroomis the purposefulness of the children in theircooperative efforts.
As Isettle in to observe for the morning, I begin to sense that, for these children, relatingto each other and working are a unified(一致的) experience.
The children's voices are low, and Ican only overhear (偶尔听到) the directedconversation of the children at the table closest to me. I realize that the way the children usetheir voices contributes to the atmosphere of respect and purposefulness in this elementaryclassroom.
I hear one of the four boys next to me announce "200-pound explosive shells”.He ispointing to a picture in one of the opened books on the table in front of him. “Did anything blow up?" one of the boys asks. All the boys look over at the opened book Two of the fourboys are taking notes. A third one is making a complicated pencil drawing from an illof a particularmodel of train. The fourth boy is using graph paper（方格纸）to compute amath problem.
A few feetaway from me, three children are sticking pins into holes on a poster boardmap of Europe. The pins have tiny red. labels attachedwith the names of countrieson them.“AIbania," I overhear one boy say as he reads a label to his working partners and puts it onthe map.
Just beyond these children, five others have newspapers spread over a large table. One ofthe children walks over to the assistant, carrying what looks to meto be the sports section ofone of the newspapers. These children must be following basketballscores or related sportsstatistics.
The only other table on which I can see the work clearly is next to this newspaper" table.This is a small table with only two children. Their books are standing up on end so that I cansee, even across the room, that they are doing a report on jungle birds and animals.
Such is an elementary class! The children are ell-occupied, learning, concentrated,interested, and purposeful Every subject area but music is covered. This classroomis sodifferent from my own elementary shooling. I want to know how this particularteacher helpsto facilitatethis outcome with this particulargroup of children.
What strongly impresses the authorin the elementary classroom?
A.The children talk to each other in a loud voice. B.The children discuss different topics in groups. C.The children are assigned a lot of leaning tasks. D.The children do cooperative learning with a purpose.绘制横断面图时，均以中线桩为准，以（）为横坐标，高差为纵坐标，将地面各点绘制毫米方格纸上。
A、水平距离
B、竖直距离
C、左边
D、右边