办公室的辅助决策工作体现在（）方面。A．信息提供 B．方案提供 C．承担决策事务 D

如图为刻蚀在玻璃上的精美的花纹图案，则该刻蚀过程中发生的主要化学反应为

A．CaCO₃＋2HCl===CaCl₂＋H₂O＋CO₂↑

B．NaHCO₃＋HCl== =NaCl＋H₂O＋CO₂↑

C．Si＋4HF===SiF₄↑＋2H₂↑

D．SiO₂＋4HF===SiF₄↑＋2H₂O

用方框中所给单词的适当形式填空， 使短文通顺、正确、连贯（每个单词限用一次）。

A Bag of Kindness

“Boys and girls, tomorrow I want you to bring a cup of macaroni（通心粉）for our craft class, OK?” These     1   from my teacher rang in my mind all evening. I was afraid of the next day because I knew we had no macaroni at home. Living in an alcoholic（嗜酒的）family, we never had too much of anything      2    beer bottles.

I went home after school. Where could I find macaroni? I knew that the local bottle shop gave ten cents for a beer bottle, so I decided to sell some bottles to get money for macaroni. I started to

3   the bottles. After selling those bottles, I earned eighty cents. Although I did my     4   ,I still had no macaroni for my craft class.

“Weren’t you     5   when I asked you to bring it, John?”my teacher asked.

I went red in the face. I didn’t know what to say and other children started laughing. Then a little girl, Rosalyn, who sat beside me turned to me and said, “You can have some of     6   .”She offered a bag of macaroni to me. The     6   in her eyes made me cry and I ran out of the room. I     8   took her macaroni or thanked her for her bag of kindness. However, I often think about Rosalyn and the way she turned to save me t hat day. I used to spend a great deal of my life complaining and keep kind people like Rosalyn     9   ,After that class, I     10   .I am grateful  to all the people like Rosalyn that made this world a better place to live in.

关于T细胞产生的细胞因子，下列叙述正确的是（）

A.是T细胞活化后产生的针对抗原的特异性物质

B.存在于静止T细胞内，T细胞活化后被释放

C.可影响B细胞产生抗体的类别

D.发挥效应具有MHC限制性

E.对淋巴细胞以外的细胞不起作用

在营销实践中，客户忠诚度被定义为客户购买行为的（）。

A.阶段性

B.依赖性

C.连续性

D.高购买力

下列哪项可作为前列腺癌的肿瘤标记物（）

A.CEA

B.CA19-9

C.PSA

D.LDH

E.CA125