Đề kiểm tra tiếng Anh lớp 10 học kì 1 số 11

One morning in November 2004, four people were swimming in the sea about 100 metres from the beach near Auckland, New Zealand. They were professional lifeguards on a training swim. Suddenly, about ten dolphins appeared and started to swim around them in circles. At first, the swimmers were worried. They thought that the dolphins were attacking them. One of the swimmers, Ann Howes, tried to swim back to the beach, but the dolphins tried to stop him and push him back to other swimmers.

Suddenly, one of the swimmers screamed. There was a three-metre shark and it was swimming towards them through the clear blue water. It came very close to the swimmers. It was only metres away, but it couldn't attack them because the dolphins were there. The dolphins stayed with the swimmers for 40 minutes. Eventually, the shark swam away and the dolphins let the swimmers return to the beach.

A scientist, Rosemery Finn, who studies the behaviour of dolphins, wasn't surprised when she heard the story. "Dolphins often help other animals and fish when they are in trouble in the sea," she said.