The president is to give a formal __ at the opening ceremony.
A
【考情点拨】考查名词词义辨析。
【应试指导】句意：总统将在开幕式上做正式讲话。giveaspeech为固定搭配，意为“发表讲话，做演讲”。debate辩论，争论；discussion讨论；argument论点，争论。
质量分别为ma和mb(ma：≠mb)，速度分别为Va和Vb(Va≠Vb)的两质点a和b，受到相同的冲量作用，则质点
Instudiorecordings,newtechniquesmadepossibleeffectsthatnotevenanelectronicbandcouldproduce.
Whentheshiplostitsenginepower,thecrewfoundthemselvesatthe_________ofthewind.
Itisessentialthatyou__________anydocumentcarefullybeforesigningit.