题目内容：

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

On a mid-September day, British climbers Rachel Kelsey and Jeremy Colenso were climbing in the Swiss Alps.

When they left their base, the weather was good, and they reached the top of the mountain.          Snow began to fall, making it difficult to see where they could put their hands and feet on the rock. After several frightening minutes, they found a narrow ledge(岩石架) and climbed on to it, hoping the snow would stop and they could continue to climb down.

         “We had to stay awake,” said Rachel, “because it was so cold that we could have died. So we told stories and rubbed our fingers to keep them warm.”

         But what could they do? Rachel had brought her mobile phone with her, but all the people she could get in touch with were in London. Still, she sent a text message at 1:30 a.m. to get help.         It read: “Need heli rescue off Piz Badile, Switzerland”. At 5:00 a.m., one friend, Avery Cunliffe, got the message. He jumped into action, called the rescue services in Switzerland, and called Rachel to tell her that help was coming.

The weather was too bad for the helicopters to operate, but Avery kept sending text messages to the climbers.        “We owe our lives to Avery,” they said when they were back at base.

A. They were both experienced climbers.

B. They decided that they had to get help.

C. They were all asleep, and nothing happened.

D. She sent the same text to five friends in the UK.

E. At about 10:00 p.m. they were lifted off the mountain.

F. The snow did not stop and the temperature dropped to -10℃.

G. But as they started the climb down, a storm struck the mountain.