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职称英语理工类:阅读理解Drug Resistancet(二)

2012-12-27  来自于:课评集

  2. Why does HIV resistance against nevirapine build very quickly even when the drug is used alone just once?

  A Because the drug is not strong enough to kill all of the HIV in the body.

  B Because there may not be a susceptibility test before using the drug.

  C Because other drugs are not present to kill the virus particles that survive nevirapine.

  D Because there are too many mutations of HIV for nevirapine to deal with.