题目内容

【题目】下表中为我国黑龙江、黄河、长江、珠江四条河流的水文特征。依据表中信息完成以下问题。

河流

长度(千米)

有无结冰期

多年平均径流总量 (亿立方米)

多年平均含沙量 (千克／立方米)

①

2215

无

3360

0.249

②

3101

有

2709

0，16

③

5464

有

660

35

④

6300

无

9500

0.54


（1）四条河流中位于南方地区的是 ( )
A.①
B.②
C.③
D.④
（2）③河流含沙量大，该流域水土保持的措施是 ( )
A.植树种草
B.毁林开荒
C.增加放牧数量，提高收入
D.缓坡建梯田

【答案】
（1）A,D
（2）A,D
【解析】（1）以秦岭-淮河线为界，以南地区的河流主要流经湿润地区，水量丰富，汛期长，含沙量小，冬季河流不结冰；以北地区的河流主要流经半湿润或半干旱地区，水量不大，汛期较短，且冬季河流有结冰现象。可判定①④河流位于秦岭、淮河以南的南方地区。根据题意，故选：AD。（2）读表可知，③为黄河；黄河下游地上河部分经常泛滥决口；地上河的成因是黄河中游流经黄土高原，黄土高原土质疏松，植被破坏，土壤裸露，一遇暴雨，水土流失严重，使黄河的泥沙大增，下游又在华北平原上，河床宽坦，水流缓慢，泥沙大量淤积，使河床抬高形成，所以治理黄河的根本措施是在黄河中游植树种草、修筑梯田，搞好水土保持工作。根据题意，故选：AD。

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Self-reflection

Definition(定义)

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Two methods

People do self-reflection either in their or by keeping diaries or notes.

Details on to do self-reflection

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Find a place.

Write down what you .

Think about the notes and make some .

Think about things you are not sure of. It is to write your questions down.

Conclusion

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