【简答题】听下面一段对话,回答1-3题 1. Why are the blood banks short of blood? A. Fewer people are giving blood. B. The number of operations is increasing. C. Many people have been hurt in accidents recently 2. Why is the...
【简答题】阅读理解。 The average has about five litres of blood living inside of their body, flowing through their vessels (血管), delivering essential elements, and removing harmful wastes. Without blood, the h...