－geneticist James Dale visited Uganda,

　　early 2000s. There, he found that 15－30 percent of children under 5

　　at risk of going blind because

　　they did not get enough Vitamin A. Dale also learned that people there love bananas.

　　eat three to eleven bananas a day. So he came up with the idea to plant bananas containing added

　　. He believed that

　　bananas could improve Ugandan's

　　.

　　the help of Bill Gates' foundation, in 2017, Dale developed the “super banana”. He added a gene to the fruit,

　　thus

　　it rich in Vitamin A. In June, “super banana”

　　human trials in the US. This invention has helped to make the world better.

　　七、

　　【参考范文】

　　How is everything going on with you? I'm writing this letter to express my apology to you for not writing you back in time.

　　In the first place, I'll be so happy if you could accept my apology. It's of great importance for me to make full preparations for the final exam last week. Therefore, I couldn't spare enough time to write you back in time. What's more, I am willing to tell you that I am to do some part－time jobs in the summer holiday. No one can deny the fact that we can have our vision broadened in the process. Last but not least,

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