Question 7 is based on the news report you have just heard.

听力原文：

    （5）A new species of snake has been discovered on a remote island in the Bahamas.

    Scientists identified 20 of the one-meter-long snakes during two trips to the Caribbean islands. The second trip was made in October last year.

    （6）One of the creatures made a dramatic appearance by moving on to the head of the team leader as he slept.

    （7）The snake has been named silver boa because it is metallic colored and the first specimen found was climbing a silver palm tree.

    The team was led by Dr. Graham Reynolds, from Harvard University, the scientist confirmed the snake was a previously unknown species after conducting a genetic analysis of tissue samples.

    Commenting on the find, snake expert Robert Henderson from the Museum of Natural History, said: “Worldwide new species of frogs are being discovered and described quite regularity. New species of snakes, however, are much rarer.

7. How did the newly discovered creature get its name？

解析：D。本题目为细节题。问题为：新生物的名字是如何命名的？出题点位置与第六题出题点位置紧挨着，为因果逻辑处。根据原文“The snake has been named silver boa because it is metallic colored and the first specimen found was climbing a silver palm tree”，可知这种蛇被命名为silver boa，因为名字既体现了蛇身体的金属颜色，又反映出蛇被发现时候正在silver palm tree上爬。选项D）From its colour与原文信息一致。