加重钻井液固相控制的要求是：既要避免加重剂（重晶石）的损失，又要尽量减少体系中的（）

患者男，25岁，因易激惹，好斗，攻击他人3h入院，患者在3周前开始每天服用朋友给他的一种药丸以保持自己清醒，应付考试。患者已经好几天几乎没有睡觉，体重明显下降，食欲下降。查体发现患者检查不合作，兴奋躁动，血压升高，心率加快，瞳孔变小，双手震颤，出汗。

对该患者进行的治疗（）

A.足量补液促进排泄

B.氟哌啶醇肌内注射

C.苯二氮类药物改善睡眠

D.营养支持治疗

E.必要时降压治疗

F.持续低流量吸氧

改革开放后设立的经济特区中，最早在近代被划定为通商口岸的是[ ]

A．深圳

B．珠海

C．汕头

D．厦门

A little boy invited his mother to attend his school’s first teacher-parent meeting. To the little boy’s (1) , she said she would go. This (2) be the first time that his classmates and teacher (3) his mother and he felt (4) of her appearance. Although she was a beautiful woman, there was a severe sear (疤痕) that (5) nearly the entire right side of her face. The boy never wanted to (6) why or how she got the sear.At the meeting, the people were (7) by the kindness and natural beauty of his mother (8) the sear, but the little boy was still embarrassed (尴尬) and (9) himself from everyone. He did, however, get within (10) of a conversation between his mother and his teacher.The teacher asked (11) ," How did you get the scar on your face"The mother replied, " (12) my son was a baby, he was in a room that caught fire. Everyone was (13) afraid to go in because the fire was (14) , so I went in. As I was running toward his bed, I saw a long piece of wood coming down and I placed myself over him trying to protect him. I was knocked (15) but fortunately, a fireman came in and saved both of us. " She (16) the burned side of her face. "This scar will be (17) , but to this day, I have never (18) what I did. "At this moment, the little boy came out running toward his mother with tears in his eyes. He held her in his arms and felt a great (19) of the sacrifice (牺牲) that his mother had made for him. He held her hand (20) for the rest of the day.

第（3）空应选择（）

A．noticed 

B．greeted 

C．accepted 

D．met

下列各组金属最适合用H₂或CO把它从化合物中还原出来的是

A．Ca、Mg

B．Al、Fe

C．Fe、Cu

D．Hg、Ag

某数的3倍与这个数的2倍的和是25，这个数是( )。

A．9

B．5

C．7

D．2