题目

“Do you think           I should attend the lecture?” she asked me. A. that B. whether  C. if   D. when 答案：A一粒种子能够生长成一棵大树，从种子结构来说，主要是由于种子内有（ ）A．种皮保护着种子 B．有完整的胚C．子叶中有营养物质 D．胚根扎根于土中