测得某砂的最大、最小及天然状态的孔隙比分别为0.85、0.62、0.71，其相对密实

Johnny Smith was a good math student at a high school. He loved his computer. He came home early every day, then he worked with it till midnight. But Johnny was not a good English student, not good at all. He got an F in his English class. One day after school Johnny joined his computer to the computer in his high school office. The school office computer had the grades of all the students: the math grades, the science grades, the grades in arts and music, and the grades in English. He found his English grade. An F! Johnny changed his English grade from an F to A. Johnny’s parents looked at his report card. They were very happy.  “An A in English!” said Johnny’s Dad. “You’re a very clever boy, Johnny.”

Johnny is a hacker (黑客). Hackers know how to take information from other computers and put new information in. Using a modem (调制解调器), they join their computers to other computers secretly. School headmasters and teachers are worried about hackers. So are the police, for some people even take money from bank computer account (账户) and put it into their own ones. And they never have to leave home to do it! They are called hackers.

小题1:Johnny changed his English grade with the computer in _______.

A．the classroom

B．the school office

C．his own house

D．a bank near his house小题2:When Johnny’s parents saw the report, they were happy because _______.

A．Johnny was good at math

B．Johnny loved computers

C．Johnny could join one computer to another

D．they thought Johnny was not poor in English any longer小题3:Who are worried about hackers in the story?

A．Johnny’s parents.

B．School headmasters, teachers and the police.

C．The police.

D．School headmasters and teachers.小题4:What should the hackers know well, do you think, after you read this story?

A．Information.

B．Grades.

C．Computers.

D．Back computer accounts.小题5:The last paragraph is about _______.

A．Johnny

B．computers

C．hackers

D．modem

钢成份中最重要的非金属元素是（）。

十个月患儿，轻咳伴发热半天，呕吐6次，不久水样便，开始为黄色后转为白色水样、量多黏液少，无腥臭，尿极少，于10月份就诊。体温39.5℃，面色苍白，皮肤弹性差，前囟及眼窝凹陷，哭泪少，咽充血，心肺正常，腹稍胀，肠鸣音活跃。

最可能诊断是()

A．轮状病毒肠炎

B．诺沃克病毒肠炎

C．致病性大肠杆菌

D．侵袭性大肠杆菌肠炎

E．产毒性大肠杆菌

下列哪项不是钩藤的性状特征（）

A.茎枝呈圆柱形或类方柱形

B.多数枝节上对生两个向下弯曲的钩，或仅一侧有钩

C.质坚韧，断面皮部纤维性

D.髓部中空或海绵状

E.气微香，味涩

某病人有定向力障碍，思维和语言不连贯，有错觉、幻觉、躁动、精神错乱，此为（）

A．嗜睡

B．意识模糊

C．昏睡

D．晕厥

E．昏迷