D．Since the 1960s，scientists have been analyzing the mysteries of the sugar canes genetic code．

E．The majority of the worlds sugar now comes from this particular commercial species．

F．Unfortunately，however，the plant started to become weaker and more prone to disease．

根据以上内容，回答46-50题。

__________.

47、 __________.

48、 __________.

49、 __________.

50、 __________.

第6部分：完形填空(第52～65题，每题1分，共15分) 下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。

51、

Exercise

Whether or not exercise adds to the length of life，it is common experience that a certain amount of regular exercise______(51)health and contributes a feeling of well-being．

Furthermore，exercise______(52)involves play and recreation(娱乐)，and relieves nervous tension and mental fatigue in So_____(53)，is not only pleasant but beneficial．

How much and what kind of exercise one should____(54)merits careful consideration． The growing child and the normal young man and young woman thrill(兴奋)with the exhilaration of strenuous sports．They fatigue to the____ (55)of exhaustion but recover promptly with a period of rest．But not so with those off middle age and beyond．For them moderation is(56)vital importance．

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