Little Duck and Little Rabbit also have a wind-bell. The ____of the wind-bell is like music. It's beautiful. Little Pig ____to hear the sound of the wind, too. Little Pig wants to make a ____wind-bell. The wind is blowing ____. But it's too ____. Little Pig doesn't like it.

细胞的大小形态：细胞很小，直径一般只有    ____     到      ____   ，要用    ____     才能看到。细胞的种类很多，形态千姿百态，如精子呈    ____    状、卵细胞呈____ 形、平滑肌细胞呈 ____     形、红细胞呈    ____    形、洋葱表皮细胞呈    ____     形等。

某同学将显微镜的使用环节与目的相匹配，得到下列四组结果，其中错误的一组是（　　）

形成风暴潮的动力因素是(   )