Don't be careless again, ______? A. will you B. are you C. did you D. do you
Don't be careless again, ______?
A. will you
B. are you
C. did you
D. do you
Don't be careless again, ______?
A. will you
B. are you
C. did you
D. do you
Don't be afraid to ______ him if you are in trouble.
A.turn in
B.turn down
C.turn to
D.turn against
A.nervous
B.careful
C.careless
D.hurried
—I always look out before crossing the street.
—You are right. You can't be too______.
A. nervous
B. careful
C. careless
D. hurried
A.Let me pay for it.
B.I do apologize.
C.What a beautiful vase it is.
D.It was very careless of me.
A.He should buy her a new dictionary.
B.She finds the dictionary very useful.
C.She doesn"t need a new dictionary.
D.He was too careless with the dictionary.
E-mail or electronic mail, is considered as the modem communication in the new age. It iscarried out in computers all over the world by millions of users. In this invisible world as many people call it,the users can send and receive letters to and from every comer of the earth. They share thoughts with pen pals (笔友)in New Zealand,ask strangers in Bombay (孟买)questions,debate with businessman in Manhattan. All of these are just happening in computers as fast as the travelling of the light,no writing and speaking,no paper and stamps are necessary.
E-mail is a pipeline to thousands of experts on everything;it is a means of meeting people with similar interests or problems. But it is not a live talk—a real conversation like those in telephones.E-mailers compose letters at leisure on their computers, then send them by phone line to an on-line service,and then they go forward to the right place. A response can be back within hours,depending on how often the recipient(接受者)checks in.
A vast global networks of on-line services for E-mail has been built. A lot of people are regularly using this service in the USA. People believe that E-mail, the computerized exchange, would create friendship and business developments, and would change people’ s life in the world. Which of the following expression is not for E-mail?
A.Communication in new ag
B.Invisible world
C.A live talk
D.Computerized exchange
Which of the following does the writer think is a shortcoming of E-mail?A.Happening as fast as the travelling of light.
B.No writing and speaking
C.No paper and stamps.
D.Response depending on the recipient.
Which of the following is NOT true?A.E-mail is carried out in computers.
B.A response of an E-mail depends on how often the recipient checks in.
C.People don, t believe that E-mail will create friendship.
D.E-mail is not a real conversation.
A.含AU>1g/t开始计价,Ag>20g/t开始计价
B.含AU>1g/t开始计价,Ag>30g/t开始计价
C.含AU>1g/t开始计价,Ag>30g/t开始计价
D.含AU>2g/t开始计价,Ag>50g/t开始计价
A.Tmax-(ag C)/0.0118L≤t≤Tmax-C/0.0118L
B.Tmax (ag C)/0.018L≤t≤Tmax C/0.018L
C.Tmax (ag C)/0.018L≤t≤Tmax-C/0.018L
D.Tmax-(ag C)/0.018L≤t≤Tmax C/0.018L
A.是1945年Burnet首先报道
B.是不成熟的T及B淋巴细胞接触Ag
C.只形成对所接触Ag的免疫耐受
D. 原则上这种免疫耐受长期持续
E.是相应T及B细胞克隆被消除
A.不成熟的T及B细胞在外周遇到抗原所形成的耐受
B.成熟的T及B细胞遇内源性Ag不产生正免疫应答
C.成熟的T及B细胞遇外源性Ag不产生正免疫应答
D. 上列A与B二项
E. 上列B与C二项