题目

 (2011·盘锦模拟)一朵梨花的哪一部分被虫子吃掉，这朵花就结不出梨了 (   ) A.花萼     B.花瓣     C.雌蕊     D.雄蕊 答案：【解析】选C。本题主要考查花的结构。梨花结构中，花萼和花瓣在开花之前都有保护作用；开花之后，花瓣能招引昆虫，帮助植物传粉；传粉受精后，雌蕊发育成果实，雄蕊凋落；被虫子吃掉雌蕊的花结不出果实。请用所给单词连词成句。1. often, We, on, Chinese, classes, have, Monday (.)___________________________________________________________________2. gets,7: 30, usually, My, up, sister, at (.)___________________________________________________________________3. on, for, Tuesdays, lunch, What, you, do, have (?)___________________________________________________________________4. goes, Peter, every, to, day, school, 7: 00, at (.)___________________________________________________________________