[单项选择] Under pressure from animal welfare groups, two national science teachers associations have adopted guidelines that ban classroom experiments harming animals. The National Association of Biology Teachers and the National Science Teachers’’ Association hope to end animal abuse in elementary and secondary schools and, in turn, discourage students from mishandling animals in home experiments and science fair projects. Animal welfare groups are apparently most concerned with high school students experimenting with animals in extracurricular projects. Barbara Orlans, President of the Scientists Center for Animal Welfare, said that students have been performing surgery at random, testing known poisonous substances, and running other’’ pathology (病理学) experiments on animals without even knowing normal physiology (生理学). At one science fair, a student cut off the leg and tail of a lizard (晰蜴) to demonstrate that only the tail can regenerate, she said. In another case, a student bound
A. Science teachers to ban testing harmful to animals.
B. Teachers’’ policy change in experiment on animals.
C. The new policies of banning harmful experiments to animals.
D. The importance of prohibiting harmful experiments on animals.

[单项选择] Under pressure from animal welfare groups, two national science teachers associations have adopted guidelines that ban classroom experiments harming animals. The National Association of Biology Teachers and the National Science Teachers’’ Association hope to end animal abuse in elementary and secondary schools and, in turn, discourage students from mishandling animals in home experiments and science fair projects. Animal welfare groups are apparently most concerned with high school students experimenting with animals in extracurricular projects. Barbara Orlans, President of the Scientists Center for Animal Welfare, said that students have been performing surgery at random, testing known poisonous substances, and running other’’ pathology (病理学) experiments on animals without even knowing normal physiology (生理学). At one science fair, a student cut off the leg and tail of a lizard (晰蜴) to demonstrate that only the tail can regenerate, she said. In another case, a student bound
A. stopping all animal abuse in schools
B. establishing guidelines that ban classroom experiments harming animals
C. protecting animals from being experimented with in extracurricular projects
D. persuading two national science teachers associations to adopt an animal protection policy

[单项选择]Animal studies are under way, human trial protocols are taking shape and drug makers are on alert. All the international health community needs now is a human vaccine for the bird flu pandemic sweeping a cluster of Asian countries.
The race for a vaccine began after the first human case emerged in Hong Kong in 1997. Backed by the World Health Organization (WHO), three research teams in the US and UK are trying to create a seed virus for a new vaccine. Their task is formidable, but researchers remain optimistic." There are obstacles, but most of the obstacles have been treated sensibly," says Richard Webby, a virologist at St. Jude Children’s Research Hospital in Memphis, Tennessee.
The biggest challenge is likely to be the rapidly mutating virus. Candidate vaccines produced last year against the H5N1 virus are ineffective against this year’s strain. Scientists will have to constantly monitor the changes and try to tailor the vaccine as the virus mutates. They can’t wait to se
A. flinch from their work.
B. hesitate and feel perplexed.
C. carry on their research.
D. abandon their research.