What is the main difference between vampire bats and common bats? A．They live in different places. B．They feed on different food. C．They go out at different time. D．The way they sleep is different.
A.They B. B．They C. C．They D. D．The E.
【参考答案】
B 文章的第一句话“…theyaretheonlymammalsthatfeedentirelyonblood．......