Vosshall and her team have also begun to study how genetics contribute to mosquitoes’ choice of a host. She’s even created a breed that is unable to sense carbon dioxide, an important trigger for the insects. “By using genetics to make mutant(变异的) mosquitoes, we can document exactly how and why mosquitoes hunt humans,” Vosshall says.

　　Once Vosshall figures out what makes mosquitoes flock to us, she can get to work on making them leave us alone. Many of her lab’s proposed solutions sound simple enough, including bracelets(手镯) that carry long-lasting repellants(驱虫剂) or traps that can reduce populations, but the breakthroughs, when they come, may save millions of lives in the developing world—and a lot of itching everywhere else.

　　28. Vosshall and her colleagues are mainly studying mosquitoes’ ______

　　A. appearance

　　B. size

　　C. behavior

　　D. change

　　29. By saying the underlined part “Then comes the hard part”, the author probably means that______.

　　A. the insects smell terrible

　　B. the experiment will last long

　　C. The researchers will probably suffer

　　D. the researchers have to study lots of documents.

　　30. Why is it less challenging to study male mosquitoes?

　　A. They are not bloodsuckers.

　　B. They are afraid of stockings.

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