【简答题】A.Stretching your arms and legs every morning. B.Buying a pair of expensive shoes in a supermarket. C.Doing five or ten minutes of warm-ups before running. D.Selecting a pair of comfortable shoes with...
【单选题】Penguins live together in large and busy colonies. Every pair has a little piece of ground. When a penguin wants to walk through his neighbor's ground he must ask for permission. If he does not, he wi...