________ TV drama You Who Came From the Stars tells a love story between a 400-year-old alien and ________ attractive human girl.
A:A; an
B:The; the
C:A; the
D:The; an
____个十
在一个淡水生态系统中,食物链是:微小生物→剑水藻→蜻蜓幼鱼→小鱼→大鱼,当这个生态系统被排入难解难分的有毒物质时,体内有毒物质含量是( )
曙光小学有3个同学参加数学竞赛,试卷有10道题,答对一道题得10分,答错或者不答均倒扣3分,最后小明得了87分、小红得了74分、小华得了9分,那么他们3人一共答对了( )道题.