如图示农田生态系统中两条主要的食物链.如果有人大量捕捉青蛙,短期内对该生态系统造成的影响是( ) A.有利于生态系统的平衡 B.水稻虫害严
-Could you help me do the dishes? -Sorry, my sister for me outside now. A. waits B. will wait C. is waiting D. was waiting
国民政府发表自上海撤退的声明指出:“各地战士,闻义赴难,朝命夕至,其在前线以血肉之躯,筑成壕堑,有死无退,阵地化为灰烬,军心仍坚如铁
阅读下面两首诗,完成8-9题。 忆秦娥 刘辰翁 中斋①上元客散感旧,赋《忆秦娥》见属,一读凄然。随韵寄情,不觉悲甚。 烧灯节②,朝京道上
一战期间是中国民族资本主义迅速发展的时期,这充分说明( ) A.帝国主义是阻碍民族工业发展的重要因素 B.民族工业摆脱了对帝国主义的依
I like to be friends with John. He is easy _______.A. get alongB. to get alongC. get along withD. to get along with
The number of traffic accidents that _______ in developing countries _______ increasing. A. happen; is B. happens; is C. happens; are D. happen; are
已知x,y满足则z=x2+y2的最小值是( ) A.B.13C.D.1