单项选择题


Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now, listen to the passage.

The proper title for this passage would be ______.

A.Rat the Cleverest
B.The Largest Grain Eater
C.Our Most Dangerous Enemy the Rat
D.The Dangerous Diseases Carrier