题目

近年来在一些重大比赛中，个别运动员置体育道德于不顾，采用不正当地竞争手段，服用兴奋剂。下列哪种物质最有可能是兴奋剂的成分？（  D ） A.胰岛素          B.生长激素          C.性激素         D.甲状腺激素 答案：D听下面一段材料，回答1-3题。1. What does Sarah decide to study?A. English.            B. Medicine.        C. Law.2. What about Jack?A. He hasn't made up his mind what to learn.B. He first intended to go to law school.C. He decided to learn market management.3. What are the two speakers?A. College students.    B. High school graduates    C. Laid-off workers.