求曲线上这样的点，使该点的切线平行于平面x+2y+z=4。

David Frost is ______.

A．an influential TV host

B．a famous movie star

C．an ambitious politician

D．a fascinating writer

Why does Mr. Purvis talk about Greek philosophy with the narrator？

A.To show that he is a learned man

B.To show that he is interested in philosophy

C.To lead to the question which is intended to humiliate the narrator

D.To brag about his knowledge

A．Formal.

B．Semi-formal.

C．Semi-informal.

D．Informal.

vie .

A.whose

B.who's

C.his

D.he's

After hearing his talk, the young man was puzzled because Addison told him ______.

A．he would die after he was famous

B．he would be famous before he died

C．he would die before he was famous

D．he would never be famous

A. RARP request

B. Show Network Address request

C. Proxy ARP request

D. ARP request

E. Show Hardware Address request

e ______.

A．they are dealing with a book together and a TV man is writing a talk show about them

B．they me going to sell a book about themselves and also appear on a TV show

C．they will buy a book through a deal and appear in a film in the coming fall season

D．they will get to know each other better by working on a book and appearing in a TV show together

Jack Ma said he believed in the 21 century small-and-medium-size businesses are going to thrive. His viewpoint runs against the author’s view in iExplore 1 of this unit. Which of them do you take sides with？ Write an essay to express your opinions.