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 main function of the barbed wire is ______.

A.fencing attracted cattle
B.that cattle shield away from the barbed wire
C.making cattle grow more quickly
D.that the garden could be used as a parking lot