【简答题】Are you a social butterfly, or do you prefer being at the edge of a group of friends? Either way, your genes and evolution may play a major 1 , US researchers reported on Monday. While it may come as ...
【单选题】Being fit is more important than being thin. Research shows that overweight or even obese(肥胖 )men who【C1】______have a lower death rate than 'normal' weight men who do not exercise. Fat【C2】______begins...