题目

_____ more forests being destroyed,huge quantities of good earth are being washed away each year. A. As   B.With    C. For   D. Through   答案：B  “麻屋子，红帐子，里面住着白胖子”是对花生果实的描述。花生在完成受精作用之后，发育成“麻屋子、红帐子、白胖子”的结构分别是A．子房、胚珠、受精卵B．子房壁、珠被、受精卵C．受精卵、珠被、子房壁D．受精卵、胚珠、子房