题目内容：

    On November 7, Lewis Pugh completed a one-kilometer swim in the freezing waters of King Edward Cove, off South Georgia in Antarctica. He was wearing only his swimming glasses, cap and speedos!

Pugh is an advocate for our oceans and seas, working to protect these ecosystem with their large diversity of marine life. When asked why he doesn’t wear a wetsuit, Lewis says, “I ask world leaders to do everything they can to protect our oceans. Sometimes the steps they need to take are difficult and unpopular. If I’m asking them to be courageous, I must also be. Swimming in a wetsuit would not send the right message.”

It took Pugh about 19 minutes to complete the one-kilometer swim in Antarctica where the water averaged about 1.6 degrees Celsius . He says that his body can only tolerate about 20 minutes in the freezing waters before it starts shutting down. As he swims, his body temperature steadily drops, which in turn causes his muscle control to drop, slowing him down. When he is done with his swim, his support team rushes him to a hot shower and it takes almost an hour for his body temperature to return to normal.

Doctors and Pugh caution that one must receive months of training to swim in such cold waters. Even expert swimmers who are unused to freezing water can drown within minutes because of the physical shock experienced by the body. Pugh says he trained for six months before this swim.

This is not the first time that Lewis has swum in dangerous conditions. In 2007, he swam one kilometer in the North Pole to draw attention to the melting Arctic ice due to climate change. In 2015, he swam in the Bay of Whales in Antarctica’s Ross Sea as part of his successful campaign to help set up a marine reserve there.

1.Why did Lewis Pugh swim without a wetsuit?

A. To swim faster. B. To show his bravery.

C. To build up his body. D. To win public attention.

2.What does the underlined word “it” in Paragraph 3 refer to?

A. His body. B. The water.

C. His body temperature. D. The water temperature.

3.What’s Pugh’s advice about swimming in freezing waters?

A. One must be fully prepared.

B. One should be expert at swimming.

C. One should be ready to take on challenges.

D. One must be used to long-distance swimming.

4.What may be the best title for the text?

A. Lewis Pugh: swimming for a cause

B. How to survive a swim in cold waters

C. How to prepare for extreme swimming

D. Lewis Pugh: achieving the impossible