语法填空
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.
的小滑块静止于P点．已知滑块和半球形容器间的动摩擦因数为μ，滑块所受支持力大小为FN ，摩擦力大小为Ff ，弹力OP与水平方向的夹角为θ．下列关系正确的是（ ）