试题与答案

由地震形成的海洋中有大小相似的甲、乙两个小岛.研究某时间段中两岛鸟的种类和数量随时间

题型:单项选择题

题目:

由地震形成的海洋中有大小相似的甲、乙两个小岛.研究某时间段中两岛鸟的种类和数量随时间变化的情况如图4所示。有关分析正确的是()

A.两岛上的鸟各形成一个种群基因库

B.最终两岛上鸟的种类和数量可能趋于相同

C.两岛存在地理隔离,不同种的鸟之间存在生殖隔离

D.甲岛上鸟的种类较多,与甲岛变化的环境导致更多变异有关

答案:

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 Many different tribes live in the Ituri rain forest of Africa, but the Pygmies are the most unusual. Most of the men are not much more than four feet tall. They weigh only about eighty pounds. The women are even smaller and thinner. But in spite of the fact that they are small, these people are perfectly formed men and women.

It is an exciting experience to visit a Pygmy encampment for the first time. Before you go, you must send word ahead that you are coming. Some friendly native or trader must take the message to the Tiki-Tikis. Otherwise the whole tribe will disappear into the depths of the jungle long before you have come close enough to be welcomed.

The great Ituri rain forest seems cut off from the rest of the earth. There are living, dead, and dying trees on every side. Except where a clearing has been burned and chopped out, a man may live his whole life in the Ituri and never see farther than twenty yards.

It takes sharp eyes to discover the almost hidden path to the Pygmy camp. The path is no wider than a small man’s foot. No sound breaks the silence in this part of the forest. There are no signs of people.

The stranger must walk carefully. What appears to be a bent branch may prove to be a deadly snake. A spotted gold patch of sunlight may be a crouching leopard(豹).

Even the Pygmy camp comes as a surprise. The leafy shelters in which the little people live are hardly three feet high. They look so much like the surrounding undergrowth that they might easily be passed by. These houses contain no furniture of any sort. The beds are merely plantain leaves spread out on the earth floor. There are no cooking pots: food is eaten raw or smoked over a fire. Spears, bows and arrows are the only possessions of these people. When the tribe moves to a new camp there is nothing to carry except these weapons and babies too small to walk.

小题1:According to the passage, we can conclude _____.

A.the Pygmies are the shortest tribe worldwide

B.the Pygmies are short but normal in mentality

C.most of the Pygmy men are more than four feet

D.the Pygmies live in the forest of America小题2:Paragraph 2 mainly suggests that the Pygmies ______.

A.are unwilling to communicate with people outside

B.are very cruel and they will kill you with the spears

C.are friendly to the tourists visiting them for the first time

D.move so fast and often that can’t be caught up with easily小题3: Which of the following word can describe the life of Pygmy?

A.Quiet.

B.Active.

C.Hard.

D.Busy.小题4:Which of the following is TRUE of the Pygmy?

A.Their houses can’t be easily found in the hurt rain forest.

B.Their houses, which are three feet high, are made of wood.

C.Weapons and cooking pots are their most valuable possessions.

D.They are living in harmony with dangerous animals around.

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