单选题 The actors have to ______ before they appear in front of the strong lights on television.
A. cover up B. make up C. paint up D. do up

【正确答案】 B
【答案解析】[解析] B项“make up化妆”符合题意。其他三项“A项cover up掩盖；C项paint up油漆；D项do up收拾整齐”都不正确。本题空格处是说演员们得化妆。因此B项为正确答案。