题目内容：
第45题答案是 ______
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.
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