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Sugar cane was once a wild grass that grew in New Guinea and was used by local people for roofing their houses and fencing their gardens. Gradually a different variety evolved which contained sucrose (蔗糖)and was chewed on for its sweet taste. Over time, sugar cane became a highly valuable commercial plant, grown throughout the world.(1) 
Sugar became a vital ingredient in all kinds of things, from confectionery (糖果點心) to medicine, and, as the demand for sugar grew, the industry became larger and-more profitable..( 2)Many crops withered (枯萎)and died, despite growers, attempts to save them, and there were fears that the health of the plant would continue to deteriorate. 
In the 1960s, scientists working in Barbados looked for ways to make the commercial species stronger and more able to resist disease. They experimented with breeding programmers, mixing genes from the wild species of sugar cane, which tends to be tougher, with genes from the more delicate, commercial type.( 3)This sugar cane is not yet ready to be sold commercially, but when this happens, it is expected to be incredibly profitable for the industry. 
( 4) Brazil, which produces one quarter of the world's sugar, has coordinated an international project under Professor Paulo Arrudo of the Universidade Estaudual de Campinas in Sao Paulo. Teams of experts have worked with him to discover more about which parts of the genetic structure of the plant are important for the production of sugar and its overall health. 
Despite all the research, however, we still do not fully understand how the genes function in sugar cane.( 5)This gene is particularly exciting because it makes the plant resistant to rust, a disease which probably originated in India, but is now capable of infecting sugar cane across the world. Scientists believe they will eventually be able to grow a plant which cannot be destroyed by rust. 

A. Unfortunately, however, the plant started to become weaker and more prone to disease. 
B. Sugar cane was now much vigorous and the supply of sugar is therefore more guaranteed. 
C. One major gene has been identified by Dr Angelique D'Hont and her team in Montpelier, France. 
D. The majority of the world's sugar now comes from this particular commercial species. 
E. Since the 1960s, scientists have been analysing the mysteries of the sugar cane's genetic code. 
F. The sugar cane's genetic code has been found by a farmer in 1950. 
G. Eventually, a commercial plant was developed which was 5 percent sweeter than before, but also much stronger and less likely to die from disease. 
1.[選詞填空]
    • 解題思路:一句講到糖是所有東西的一個重要成分,因此對糖的需求在增長,下一句說到“盡管種植者試圖拯救它們,仍有許多作物枯萎死亡”。由此可知,空格處與前面形成轉折關系,故選A。
    2.[選詞填空]下一句說到“該基因特別令人興奮,因為它使植物可以抵抗銹病”,由此可知,空格處應是跟基因相關的內容,故選C。
      3.[選詞填空]
        • 解題思路:上一句說到“科學家嘗試不同的育種,用更微妙的商業型甘蔗基因進行混合”,下一句說到“這種甘蔗還沒有準備好進行商業銷售”。由此可知,空格處應是科學家培養出了一個新品種的甘蔗,選項F與上下文聯系最緊密,故選G。
        4.[選詞填空]
          • 解題思路:上一句講到這種甘蔗還不能大量出售,但一旦能夠出售,將會產生難以置信的利潤;下一句說到“巴西出產世界食糖的四分之一。它已經在位于圣保羅的坎皮納斯大學的保羅·阿魯多教授的負責下,發起一項國際合作項目”。由此可知,空格處應是講這種甘蔗的現狀和優勢,科學家才研究它的基因,選項B與上下文聯系最緊密,故選B。
          5.[選詞填空]
            • 解題思路:上一句說到“隨著時間的推移,甘蔗成為一個生長在世界各地的非常有價值的商業作物”,下一句說到“糖在各種事物中都是一種重要成分,從糖果到藥物”。由此可知,空格處應講甘蔗和糖的關系,選項D與上下文聯系最緊密,故選D。
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            • 參考答案:A,C,G,B,D