In this section, you will hear several passages.
Listen to the passages carefully and then answer the questions that
follow. Questions 11 to 14 are based
on the following passage. At the end of the passage, you will be giv en 20
seconds to answer the questions. Now, listen to the
passage. All of the following are causes of being bitten by mosquitoes EXCEPT ______.
A．carbon dioxide and other odors B．sweat C．the quality of your skin D．heart and blood pressure medicine