【单选题】

Questions 11 to 14 are based on the following passage.At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage.

All of the following are causes of being bitten by mosquitoesEXCEPT______.A．carbon dioxide and other odors
B．sweat
C．the quality of your skin
D．heart and blood pressure medicine