外研版高一英语必修第二册(2019版)_Unit6_单元背景探索阅读

阅读提示：在加利福尼亚水族馆，一条大白鲨攻击了两条翅鲨，并导致其死亡。

A great white shark in a California aquarium attacked two soupfin sharks，causing their deaths. The attack was not a natural action for food，but a kind of response when the two sharks swam too close to the great white. The great white didn’t attack other fellows, but the officials had to move other soupfin sharks to another tank for their safety.

These attacks had given rise to calls for the freedom of the 88-pound， 5-foot-3-inch shark. The aquarium housed the shark in a huge tank. However, according to experts, the tank was not big enough for the shark. Its nose was bloody from striking the glass of the aquarium. Great white sharks in the wild had a large amount of migration，sometimes traveling 50 miles a day.① Because the shark was still young, there was possibility of its growing. As it grew, it could become more troubled in the limited space.

Aquarium officials said that keeping the sharks in the aquarium allowed them to study their behaviors，which they could not study with free great white sharks. ②When they figured out the behavioral patterns, scientists believed that they could help great white sharks back to the wild.

Since the sharks had been on display，the number of people who visited the aquarium increased greatly. ③ This one-year-old shark was the longest surviving great white living here. It had been at the Monterey Bay Aquarium for six months. Other great whites did not survive for longer than 16 days in the aquarium.

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