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【单选题】

Life of the Samoans
①The Samoan islands are 2, 300 miles south of the Hawaiian islands. Though the land is steep, the islands have a plant cover watered by up to 200 inches of rain a year. All that rain does not affect outdoor activity much, since the showers do not last long. And the water disappears quickly into the soil.
②The Samoans plant three major tree crops. They require little work except in harvesting. Once planted, with a few years of waiting, the breadfruit tree continues to produce about two crops a year for up to half a century. Coconut(椰子)trees may continue to produce for a hundred years And banana trees make new stems of fruit for many years.
③The Samoan men also clear small land for a crop called taro. But even taro doesn't require much work; planting requires nothing more than slightly burying the top sliced off a root just harvested. Young men do most of the planting and harvesting and women mostly do the occasional weeding.
④This kind of farming behavior makes people think the Samoans are lazy. But they cannot weed as often as European farmers. In contrast with the flat European farmlands, the land of Samoa is steep. The casual farming allows the deep and shallow roots of the various plants growing together to hold the loose soil.
⑤The Samoans keep chickens and pigs, but they are eaten only occasionally. The major
source of animal protein(蛋白质)for the Samoans is fish. Younger men may swim in the deep sea for fish; older men will be more likely to stand on the reef(珊瑚礁)and catch the fish swimming inside the reef.
The Samoans do not need to work a lot to_____.

A.
up to 200 inches
B.
mostly weed the land
C.
make the tree crops grow
D.
they are not eaten very often
E.
the Samoans do not work hard
F.
2.300 miles from the Hawaiian Islands
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参考答案:
举一反三

【单选题】营养学家建议我国青少年要多吃奶、蛋、鱼、肉等含蛋白质丰富的食品,因为蛋白质是:( )

A.
人体主要的供能物质
B.
容易消化的物质
C.
人体生长发育必需的物质
D.
人体的备用能源物质

【单选题】Text 2 We recently sailed with our research ship through the Red Sea to the Indian Ocean where we did research work for about a year. Our main objectives (目标) were the little-known Maldi...

A.
the coral reef exists in regions with warm climate
B.
the coral reef provides favorable living conditions for them
C.
the creatures are away from the danger of being eaten by sharks
D.
most sea creatures feed on the colourful coral

【单选题】蛋白质属于()

A.
植物化学物
B.
宏量营养素
C.
微量元素
D.
宏量元素
E.
抗氧化营养素

【单选题】()为蛋白质的基本结构。

A.
一级结构
B.
二级结构
C.
三级结构
D.
四级结构

【单选题】属于蛋白质和氨基酸的代谢试验的是

A.
VP试验
B.
吲哚试验
C.
氰化钾试验
D.
硝酸盐还原试验
E.
触酶试验
相关题目:
【单选题】营养学家建议我国青少年要多吃奶、蛋、鱼、肉等含蛋白质丰富的食品,因为蛋白质是:( )
A.
人体主要的供能物质
B.
容易消化的物质
C.
人体生长发育必需的物质
D.
人体的备用能源物质
【单选题】Text 2 We recently sailed with our research ship through the Red Sea to the Indian Ocean where we did research work for about a year. Our main objectives (目标) were the little-known Maldi...
A.
the coral reef exists in regions with warm climate
B.
the coral reef provides favorable living conditions for them
C.
the creatures are away from the danger of being eaten by sharks
D.
most sea creatures feed on the colourful coral
【单选题】蛋白质属于()
A.
植物化学物
B.
宏量营养素
C.
微量元素
D.
宏量元素
E.
抗氧化营养素
【单选题】()为蛋白质的基本结构。
A.
一级结构
B.
二级结构
C.
三级结构
D.
四级结构
【单选题】属于蛋白质和氨基酸的代谢试验的是
A.
VP试验
B.
吲哚试验
C.
氰化钾试验
D.
硝酸盐还原试验
E.
触酶试验
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