1. From the passage we can learn the weather conditions of the polar continents are _____. 
　　　A) fierce
　　　B) moderate
　　　C) comfortable
　　　D) nice

　　2. The author wants us to realize the fact that _____. 
　　　A) human beings don’t like to live in cold places
　　　B) the polar continents will be likely populated
　　　C) the polar continents are worth being developed
　　　D) where there are vegetables, there are lives

　　3. The passage indicates that _____. 
　　　A) human’s living space is being threatened by the increasing population
　　　B) civilization or industrial development has not polluted the polar continents
　　　C) there are many places on the earth’s surface that can be inhabited by humans
　　　D) plants cannot grow on the land covered with ice and snow