A、The darkness and cold. B、The heavy snow and fog. C、The biting winds. D、The ice all around. A新闻中提到，由于黑暗和寒冷，通常在二月到十月期间不会有飞机飞往南极点

A small plane with two sick US 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 roundtrip from the British station Rothera to pick up the workers at the US 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. 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’re not careful, it’ll come round and bite you.”
Questions 3 and 4 are based on the news report you have just heard.
3. What was the small plane’s mission to Antarctica?
4. What makes flying to Antarctica dangerous from February to October?