单项选择题A．How animals react to frightening situations.B．Why mice are particularly fearful animals.C．Whether fearfulness is a genetic trait.D．Why certain animals are feared by humans.

单项选择题A．Her room is too little to agree to it.B．She is not interested in the topic.C．She couldn’t afford it, since she has little room to afford it.D．She didn’t have enough time for it.

单项选择题A．To protect beachfront property.B．To reduce the traffic on beach roads.C．To provide privacy for homeowners.D．To define property limits.

单项选择题A．He thinks it is not worth worrying about.B．He thinks he can bring some sponsors to her.C．He thinks he can offer a better job.D．He will be one of the sponsors, if she’ll share the commission.

单项选择题Smoking not only ______ the throat but can also cause cancer, loss of appetite and irregular heart beat.