The resistance to vaccine has continued for decades, and it is driven by a real but very small risk. Those who refuse to take that risk selfishly make others suffer.

　　Making things worse are state laws that make it too easy to opt out(决定不参加) of what are supposed to be required vaccines for all children entering kindergarten. Seventeen states allow parents to get an exemption（豁免), sometimes just by signing a paper saying they personally object to a vaccine.

　　Now, several states are moving to tighten laws by adding new regulations for opting out. But no one does enough to limit exemptions.

　　Parents ought to be able to opt out only for limited medical or religious reasons. But personal opinions? Not good enough. Everyone enjoys the life-saving benefits vaccines provide, but they’ll exist only as long as everyone shares in the risks.

　　63．The first two paragraphs suggest that ____________.

　　A．a small number of measles cases can start a dangerous trend

　　B．the outbreak of measles attracts the public attention

　　C．anti-vaccine movement has its medical reasons

　　D．information about measles spreads quickly

　　64．Herd immunity works well when ____________.

　　A．exemptions are allowed

　　B．several vaccines are used together

　　C．the whole neighborhood is involved in

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