题目

Don't give up        English and you must spend more time        it.A.studying; learningB.studying; learnC.to study; to learnD.to study; learning 答案：【答案】A【解析】句意：不要放弃学习英语，你必须花更多的时间学习它。give up doing sth.”放弃做某事“；spend some time doing sth.”花费时间做某事“。结合句意可知，答案为A。 下列生物中不属于单细胞生物的是 （ ）A.变形虫B.甲壳虫C.草履虫D.酵母菌