题目

Most senior high school students are working hard day and night to pass the college entrance examination，gaining______to a university. A. application       B. connection        C. admission      D. agreement   答案：C 考查名词辨析。admission允许进入，后常跟介词to。application申请，应用; connection联系; agreement同意。已知向量=（sinA，cosA），=（，-1），•=1，且A为锐角．（1）求角A的大小；（2）求函数f（x）=cos2x+4cosAsinx（x∈R）的值域．