(49) Brazil, which produces one quarter of the worlds 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 in sugar cane.

(50) 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. Scientist believes they will eventually be able to grow a plant which cannot be destroyed by rust.

请在第__(46)__处填上正确答案。

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

B．Sugar cane is now much more vigorous and the supply of sugar is therefore more guaranteed.

C．One major gene has been identified by Dr. Angelique DHont and her team in Montpelier, France.

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

E．Since the 1960s, scientists have been analysing the mysterious of the sugar canes genetic code.

F．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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