近年来，中东地区冲突不断。前有西方势力兴风作浪，发动了入侵利比亚的战争，后有叙利亚国内爆发大规模冲突，造成大量平民伤亡。在这些事件中，美国和西欧国家表现了较强的文明认同感和行为协同性，令人关注。探究历史，回答下列问题。

    We use flowers as messengers, to say something we might have trouble saying____ (direct) ourselves. Over time flowers have come to symbolize the most powerful human experiences: beauty, love, hope, and rebirth. Sweet flowers alone can say____ one fears expressing. We've listed some of the most famous flowers ____ have a special significance.

    In Mao Zedong's poem Ode to Plum Blossom (《咏梅》), the plum blossom was used____ (praise) great soldiers who sacrificed their lives for a better life for Chinese people.

    ____ great Chinese poet Li Bai from the Tang Dynasty once compared Yang Yuhuan's beautiful face to blooming peonies(牡丹). Flowering in May, peonies' large petals and strong colors are linked to prosperity(成功) and____ (rich) in traditional Chinese culture. The orchid (兰花) is well known for its delicate smell. Beautiful articles and poems____(call) “lanzhang” by Chinese people in ancient times. Roses, of course, have the____(colorful) meaning among all the flowers. Red roses mean “I love you.” A red rose, rather than yellow roses,____ (act) as the traditional romantic gift given to your love on Valentine's Day. Sending yellow roses can be risky, as they represent either friendship ____ envy.

下面是与高中生物实验有关的内容，请回答相关问题：

（1）A组实验中用同一个显微镜观察了同一装片四次，每次仅调整目镜或物镜、细准焦螺旋，结果如图1所示．其中视野最暗的是____ ．

（2）B组实验中还需要加入的试剂是____ ，其作用是____ ．图2表示B组实验新鲜菠菜叶中四种色素在滤纸条上的分离结果示意图．其中色素带c是____ ，呈现为____色．请指出该结果的错误之处____ ．

（3）C组实验观察到特定的颜色是____ ，用正常人的尿液重复实验观察到的颜色是____ ．

（4）做D实验时，主要观察根尖分生区细胞，呈____ 形；某同学绘制了如图3细胞分裂期的四个时期模式图，四图出现的先后顺序为____ （用字母表示）．