Question 4 is based on the news report you have just heard.

听力原文

    (3) A small plane with two sick U.S. workers arrived safely in Chile late Wednesday after leaving Antarctica in a daring rescue mission from a remote South Pole research station. After making a stop for a few hours at a British station on the edge of Antarctica, the two workers were flown to the southernmost Chilean city of Punta Arenas. In a chaotic two days of flying, the rescue team flew 3,000 miles round-trip from the British station Rothera to pick up the workers at the U.S. Amundsen-Scott Station at the South Pole. “The two patients aboard will be transported to a medical facility that can provide a level of care that is not available at Amundsen-Scott,” says a spokesperson. (4) Normally, planes don’t go to the polar post from February to October because of the dangers of flying in the pitch-dark and cold. “Antarctica creates a hostile environment,” says the operations director for the British Antarctic Survey. “If you are not careful, it’ll come around and bite you.”

4. What makes flying to Antarctica dangerous from February to October?

解析：A。根据录音后半部分可知，通常飞机在二到十月份不会飞往极地，因为在漆黑和寒冷的状态下飞行是很危险的，A项与录音信息一致，故正确。B、C、D项未提及，故排除。