如下图，若茎的a侧生长素浓度在B点以下的浓度范围内，下列对b侧生长素浓度范围的描述较为准确的一项是(       )

 3吨的 $\frac{1}{5}$ 和1吨的 $\frac{3}{5}$ 一样重。

注意：1)发言稿须包含上述要点,但可适当发挥,使讲话完整通顺。

      2)100词左右。

Dear classmates,

    It's a pleasure for me to have a chance to make a short speech today.

阅读下面这首古诗，回答以下两题。
                                                                                                            夏 意（苏舜钦）
                                                                                                           别院深深夏席清，
                                                                                                           石榴开遍透窗明。
                                                                                                           树阴满地日当午，
                                                                                                           梦觉流莺时一声。
                                                                                             注：别院，即正院旁侧的小院。