理想与现实的关系是()。
A. 理想与现实是对立统一的
B. 理想有时遥不可及,不如现实一点
C. 现实太残酷,不如活得理想化一点
D. 现实中包含理想的因素
E. 理想中包含现实
半固体培养基中,琼脂使用浓度为固体培养基中,琼脂使用浓度为。
—— Dad, I ________ the station for minutes, but nobody came to meet me.—— Don’t worry. I’ll go to meet you soon.
A. arrived at
B. have been at
C. will reach
D. am reaching
Echo _____ for half a month. She’ll come back in two months.
A. left
B. leave
C. has left
D. has been away