【題目】中國龍---黃河哺育了燦爛的中華文明,但其身體上也存在許多病癥。讀圖,回答下列問題。

1黃河各河段病癥的成因及對癥的藥方組合正確的是( )

A.大量脫發(fā)-----氣候寒冷干旱加高、加固堤壩

B.腹瀉-----地表植被遭到破壞退耕還林、還草

C.腳腫-----黃土結(jié)構疏松,地表崎嶇在下游修筑梯田

D.動脈阻塞-----過度放牧與墾殖建立自然保護區(qū)

2黃河上游進行梯級開發(fā)的有利條件是( )

A.地處我國階梯交界處,河流落差大

B.屬于亞熱帶季風氣候,年降水量大

C.地勢平坦,水量大,水流平緩

D.地處北方地區(qū),氣溫高,蒸發(fā)旺盛

【答案】

【1】B

【2】A

【解析】

試題分析:

【1】“大量脫發(fā)”指荒漠化,是干旱地區(qū)地表植被受到破壞造成的,不能用加固大壩來解決,A錯;腹瀉指的是水土流失,主要是地表植被嚴重破壞造成的,要加強退耕還林、增加地表植被覆蓋率,B正確;“腳腫”指地上河,地上河的發(fā)生也和中游地區(qū)的水土流失有關,但不晨下游修梯田,而應加固大壩, C錯;“動脈阻塞”指的凌汛現(xiàn)象,不是過度放牧造成的,應當是疏浚河道,而不是建立自然保護區(qū), D錯。選B正確。

【2】黃河上游地處我國地勢階梯交界處,河流落差大,水能資源豐富;這里是溫帶大陸性氣候,年降水量較少;上游進行梯級開發(fā)主要是利用河流的水能。選A正確。

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