依次填入下段文字中横线处的词语,最恰当的一项是（    ）

    艾青说:“我所努力的对诗的要求是四个方面:        ,有意识地避免用华丽辞藻来掩饰空虚；        ,以一个意象来表明一个感觉和观念；        ,以全部力量去完成自己所选择的主题;        ,不含糊其词,不写让人费解的思想,决不让读者误解如堕五里雾中。”

Dear Liza,

    I will be ten years old on Friday, 22nd July. To celebrate my birthday, I will invite several friends and I hope that all of you will be able to come to the party on that day.

    There will be two parts in my party. The first will be at the swimming pool near our school. Please bring your swimsuit (游泳衣) and a change of clothes. We have planned some pool games. My parents will be at the pool to protect the swimmers. The pool party will be from 2 to 3 p.m.

    The second part of the party will be at my house. A bus will take us all from the pool to my house. A singer is coming to my house. He will sing popular songs for us. I am sure you will enjoy them. The home party may last till 5 p.m.

    Please let me know by Friday, 15th July, whether you will come to my party, so that I will know how much food to prepare.

Love

Tracy

以下关于能量的转化的叙述中正确的是（  ）