图中， ①、②、③、④、⑤表示某区域地形类型中的山脊和山谷，点a、b、c对应的海拔分别为900米、600米、300米。读图完成题。
小题1:其中表示山谷的有（ ）
A．①、③
B．②、④
C．①、③、⑤
D．②、③、④小题2:①、②、③、④沿线坡度最平缓的是（ ）
A．①
B．②
C．③
D．④
小题1:B
小题2:A
题目分析：
小题1:把图中数据相等的点用较平滑的曲线连起来，即构成等值线略图，可以看出在②、④处等高线向高处凸出，为山谷。
小题2:①处等高线最稀疏， 山地坡度最平缓。
点评：本题难度适中。对学生作图能力有一定的要求。
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| One bright summer day, boys and girls were having a walk with their teacher near the zoo. They walked and 1 happily. After a while, they came to a 2 over the river, and they took turns to go across it. When they just reached the middle, there came a great shout of warning behind them. The teacher told them 3 , and she turned back and listened. When she heard the voice" 4 !", she knew what would happen. Before she could do anything she saw a wolf 5 towards the bridge. "Children," said the teacher,"Don't worry, don't move 6 cry." Then she ran to the back of the children 7 the wolf should meet her first. The wolf came, and its mouth was widely open. When it passed the teacher, the wolf saw a boy. It stopped and wanted to snap (咬) at the boy. When the teacher 8 this, she put her right hand into the wolf's 9 quickly. The wolf was so frightened, and it 10 at once. When people heard of it, they all spoke highly of her bravery (勇敢). | ||||
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