A．(A) No one in this office is willing to do the translation except yourself.

B．(B) The new secretary will ask someone to fix the date for you.

C．(C) The new secretary can type and hand in the document for you.

D．(D) The secretary is an able person to help you with the translation.

在DNA双螺旋中，两链间碱基配对形成氢键，其配对关系是

A．T＝A　C≡C

B．G≡A　C≡T

C．U＝A　C≡C

D．D＝T　T＝A

E．C＝U　C＝A