问题 综合

阅读分析材料,结合有关知识,完成下列各题。(13分)

(1)分析甲地夏季降水多的原因。(4分)

(2)分析乙地的自然地理环境特征。(5分)

(3)简述在N国推广高产水稻种植将面临的限制性因素。(4分)

答案

(1)赤道低气压带北移;夏季西南风从海洋上来,湿润;迎风坡降水多;暖流增温增湿。

(2)纬度低,居内陆;地势低平;气候干旱;荒漠为主;土壤干燥。

(3)地形起伏大;劳动力种植经验少;科技落后;水利基础设施落后。

题目分析:

(1)读图可以判断,图示地区是非洲几内亚湾沿岸。读图例可知,夏季这里盛行西南风,甲位于西南风的迎风坡,带有大量湿热水汽的西南风在甲处受地形影响,多地形雨。沿岸有暖流经过,暖流增温增湿。夏季,赤道低气压带北移,甲地受赤道低压带影响多雨。

(2)结合图例看,可以看出乙地以荒漠为主,乙北面有20°N纬线,纬度低,气温高,蒸发旺盛。乙地居于内陆,受信风带影响,降水少。所以气候干旱,土壤干燥。从等高线分布看,等高线稀疏,说明地形平坦。

(3)读图,根据图中N地等高线的分布可以判断,等高线密集,且弯曲较多,说明地形起伏大。水稻种植业是劳动密集型产业,要求精耕细作,这里不是水稻产区,劳动力种植经验少。水稻生产要求完善的水利基础设施,灌水、排水方便。非洲尼日利亚是发展中国家,科技落后,水利基础设施落后。

选择题
单项选择题

阅读下面短文,掌握其大意,从每题所给的A、B、C、D四个选项中,选出最佳选项,并在答题卡上讲该项涂黑。

A Race Against Death

It was a cold January in 1925 in North Alaska. The town was cut off from the rest of the world due to heavy snow.

On the 20th of that month, Dr.Welch   36   a Sick boy, Billy, and knew he had diphtheria, a deadly infectious(传染的)disease mainly affecting children. The children of Nome would be  37  if it struck the town. Dr.Welch needed medicine as soon as possible to stop other kids from getting sick.   38  , the closest supply was over 1,000 miles away, in Anchorage.

How could the medicine get to Nome? The town`s  39  was already full of ice, so it couldn`t come by ship. Cars and horses couldn`t travel on the   40  roads. Jet airplanes and big trucks didn`t exist yet.

41  January 26, Billy and three other children had died. Twemty more were   42  . Nome`s town officials came up with a(n)  43  . They would have the medicine sent by   44  from Anchorage to Nenana. From there, dogeled(狗拉雪橇)drivers—known as “mushers”—would   45  it to Nome in a relay(接力).

The race began on January 27. The first musher, Shannon, picked up the medicine from the train at Nenana and rode all night.  46  he handed the medicine to the next musher, Shannon`s face was black from the extreme cold.

On January 31, a musher named Seppala had to   47  a frozen body of water called Norton Sound .It was the most  48  part of the journey. Norton Sound was covered with ice,which could sometimes break up without warning.If that happened,Seppala might fall into the icy water below.He would  49  ,and so would the sick children of  Nome.But  Seppala made it across.

A huge snowstorm hit on February 1.Amusher  named Kaasen had to brave this storm.At one point,huge piles of sonw blocked his 50  .He had to leave the trail (雪橇痕迹)to get around them.Conditions were so bad that it was impossible for him to  51  the trail again. The only hope was Balto,Kaasen’s lead dog, Balto put his nose to the ground, 5 2  to find the smell of other dogs that had traveled on the trail.If  Balto failed,it would mean disaster for Nome.The minutes passed by.Suddenly, Balto began to  53  .He had foung the trail

At 5:30 am on February 2, Kaasen and his dog  54  in Nome. Within minutes,Dr.Welch had the medicine.He quickly gave it to the sick children.All of them recoverd.

Nome had been  55  .

46()

A.Though

B.Since

C.When

D.If