题目

某同学在两只同样的花盆中种下蚕豆种子，并设计了如下实验，从该实验可知：影响大豆发芽的因素是                                                      （      ） 花盆光线情况温度水 甲向阳处5oC充足 乙向阳处20oC充足 A.阳光               B.空气             C.温度              D.水分— How about going to the park this afternoon? —_______? It’s a few months since I enjoyed myself in the park． A．Why          B．Why not      C．What for             D．What