He was _______ the preparation of an international conference when I arrived in Beiji

A.p（He）＞p（H2）＞p（N2）

B.p（H2）＞p（He）＞p（N2）

C.p（H2）＞p（N2）＞p（He）

D.p（N2）＞p（He）＞p（H2）

A.H

B.K

C.P

D.He

A.He

B.H

C.N

D.P

hysics)

A.Because he is named by his parents this way

B.Because his skin color is dark

C.Because he writes like William Wordsworth

D.Because he is as great as William Wordsworth, the white poet

A.The economic crisis broke out first in the united States.

B.He decided to get married.

C.I think he is right.

D.He is looking fit.

He was by nature a sociable, chatty man and he had reckoned that his action would () produce conversation

A、infallibly

B、bounced

C、concentrate

D、acclamation

ocket, making, money, some)

A.P

B.HTTA

C.HE

D.HEAT

E.PCH

F.PCR