题目

---I hope you enjoyed the film last night.    ---How on earth do you know I went to a film? I   you. A. won’t tell  B. didn’t   C. haven’t told  D. don’t tell 答案：B心脏内以及心脏和动脉之间的瓣膜使血液的流动只能是（   ） A．右心房—右心室—肺动脉                          B．左心室—左心房—主动脉 C．肺动脉—右心房—右心室                          D．主动脉—左心房—左心室