题目

Jennifer exercises every day, so she is always full of_______.A. knowledge B. energy C. information 答案：【答案】B【解析】句意：珍妮佛每天锻炼，因此她总是精力充沛。A. knowledge知识；B. energy精力；C. information信息。结合句意可知，锻炼身体就会精力充沛，故答案为B。tan45°+12sin30°= ．