第19题: [填空题]According to Dr. Collins, how to prevent those patents A. A.To stop clinical lab from doing diagnostic testing B.To order government labs to make every new gene discovery public knowledge C.To pass laws prohibiting private ownership of genome patents.
第23题: [单项选择]When you are in your room, leave the door ______ so that your visitors do not have to knock. A. open B. opened C. opening D. being open 参考答案:A 答案解析:[解析] “leave...+v.示“让……保持一种状态”,后面应该用动词原形或形容词形式。