Sixteen biologists, ethicists and policymakers are on an NAS committee that is examining the issue. They say that there is value to the new technology. But, they say, there is not enough evidence to support the release of modified organisms from the laboratory into nature.

　　Many people would support stopping mosquitoes and rats from carrying diseases. But scientists say we must understand the possible scientific, ethical, legal and social results of such action before we decide whether to take it. Gene modification is spread through reproduction.

　　Changed genes will continue to spread as long as an animal or plant continues to reproduce. They cannot be limited to a farm or kept within a country's borders. Scientists are wondering what may happen if a modified organism mates with another species. They are not yet sure how the modified genes would affect the other species. It is possible that those genes could harm those creatures or even lead to their disappearance from our planet.

　　58. What possible advantage does gene control in wild animals and plants have?

　　A. Changing the Zika virus permanently.

　　B. Getting rid of damaging species forever.

　　C. Having the changed genes in their next generations.

　　D. Making all the species more productive and stronger.

　　59. Which of the following is true according to the passage?

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