D. A blight may be a national infection.
39. According to the passage, some plant diseases can be prevented by
A. killing parasites
B. inoculation
C. killing insects
D. improving growing conditions
40. Which of the following statements is not true?
A. Some plant diseases may be caused by bacteria.
B. Some plant diseases may be caused by pathogens.
C. Some plant diseases may be caused by fungus.
D. Symptoms are always helpful in identifying diseases.
参考译文
农作物的病害
跟动物一样,植物也会受到各种疾病的侵袭。世界上大约有3万种侵害经济作物的疾病:已经知道有40种会侵害玉米,还有40种会侵害小麦。在食物匮乏的国家中,由植物疾病失控所引起的后果非常严重。随着世界人口以惊人的速度增加,植物疾病所引发的问题将越来越广泛。即使是在那些现在有足够的食物供给的国家,不久也将面临食物匮乏的问题。当某种主要农作物遭到灾难性病害时,我们不难想象其后果会是怎样;由此引发的饥荒将导致大量人口的死亡,而幸存的人由于度日艰难,也会引起政治上的动荡,对世界秩序产生灾难性影响。
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