猫的牙齿主要是用于磨碎食物，便于进食。

单项选择题The text “Climate Change: No Eden, No Apocalypse” suggests that climate change will bring us ultimate destruction, but also that we can somehow “stop” climate change to take us back to some fantasy world of perfection.（ ） A. 对 B. 错

单项选择题T F: A structured questionnaire is given to a sample of a population and is designed to elicit specific information from respondents when using the survey method.