问题 综合

读图,回答下列问题。

(l)描述图示地区主要地形区的分布状况。

(2)简述黄河乌海至磴口段河流流向及水文特征。

(3)指出河套平原的年降水量分布特征,并分析原因。

河套平原素有“塞上米粮川”之称,是内蒙古自治区粮、油、糖生产基地。

(4)指出该地发展农业生产的限制性自然因素,并说明进行改造的方式及可能引发的问题。近10年来,土默川平原实施退耕还草工程,使这一地区成为中国“乳都”呼和浩特的核心奶源基地。

(5)分析产生这一转变的社会经济因素。

答案

(l)阴山山脉位于北部,呈东西走向;河套平原位于中部,东西延伸;鄂尔多斯高原位于南部,沙漠广布。

(2)从南(西南)向北(东北)流动(或从低纬向高纬流动);流量大,含沙量高(或含沙量比中下游低),有冰期,冬春季有凌汛。

(3)年降水量大多在150毫米至400毫米之间。自西向东逐渐增多(或自东向西逐渐减少);从西(东)向东(西)距海(或太平洋)越来越近(远),夏季风影响逐渐增强(减弱)。

(4)降水;引黄河水进行灌溉;土壤盐渍化,下游水资源短缺。

(5)生态保护的需要;消费者对乳品需求的增加;交通运输条件的改善;乳品冷藏、保鲜技术的发展。

(l)明确地形区的名称、分布状况是以空间位置为线索进行描述的。

(2)在河流总体流向之中把握某一段的流向,描述河流水文特征,首先要清楚河流水文特征的四个方面,然后结合该河流进行具体分析。该河段属于黄河上游,流量大;尚未流经黄土高原,所以含沙量比中下游低,但黄河上游地区植被条件较差,此段河流的含沙量比一般河流高;有结冰期,并必须提及此河段的凌汛现象;水位变化大。

(3)分析图中等降水量线分布规律,容易得出河套平原年降水量自西向东逐渐增多,且在150~400mm之间的结论。原因自然是距海远近所致。

(4)干旱是西北地区最主要的自然特征,降水就成为该地发展农业生产的主要的限制性自然因素;河套平原是我国西北地区典型的灌溉农业区,灌溉水源就是黄河水;灌溉农业容易引发的生态环境问题主要是次生盐碱化和下游地区水资源短缺。

(5)调整农业结构,因地制宜保护生态环境。另外,市场、交通、科技、政策都是重要的影响农业生产的社会经济因素。

阅读理解

Now more and more people may experience excessive (more than normal) hair loss(掉发). Hair loss of this type can affect men ,women and Children. But what causes excessive hair loss?

A number of things can cause excessive hair loss.For example,about 3 or 4 months after an illness,you may suddenly lose a large amount of hair ,This hair loss is related(与……有关)to the stress of the illness and it won’t last long.

For example,many women notice hair loss about 3 months after they’ve had a baby .This loss is also related to hormones (激素). During they have babies,high levels of certain hormones cause hair loss. When the hormone return to normal levels.The normal cycle of growth and loss starts again.

Another way of hair loss is the improper care of your hair .If you wear pigtails(辫子)or use tight (紧的)hair rollers, the pull(拉)on your hair can cause a type of hair loss.

Some medicine can cause hair loss.This type of hair loss improves when you stop taking the medicine.Medicine that can cause hair loss includes blood thinners,medicine used to treat cancer ,Vitamin A(if too much is taken),birth control pills and so on.

But how to stop hair loss ? Perhaps your doctor can help you.He will probably ask you some questions about your diet,any medicine you’re taking,whether you’ve had a recent illness and how you take care of your hair.

Medicine may also help slow or prevent(阻止)the development of hair loss Some medicine is helpful.but you had better ask for doctors’ advice .

任务:请阅读上面短文,根据短文内容完成下面表格中的有关信息。

What causes hair loss?How to stop hair loss?
Hair loss is related to小题1:Doctors can help you
The 小题2:    may cause hair 1oss, such as wearing pigtails ,using tight hair rollers and so on.小题3:        may help prevent hair loss if doctors permit.
小题4:       can cause hair loss.

单项选择题