单项选择题A．By sending water directly back to the sea with great force.B．By reducing wave energy.C．By reducing beach width.D．By stabilizing beachfront construction.

单项选择题A．It’s now taught with the aid of computers.B．It isn’t considered as important today as it was in the past.C．Children today learn it earlier than those did in the past.D．A lot of time is spent teaching it.

单项选择题A．Members have a narrow range of topics to discuss.B．Members bring up the most important issue.C．Members have little knowledge.D．Members have interesting topic.

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.