获得质核互作雄性不育材料是选育不育系的前提,其途径主要是。

A)The job is suitable for him.
B)The job is easy to do.
C)The job is interesting.
D)The job is well paid.

A)Mary doesn't know where the copy room is.
B)Mary doesn't know how to make copies.
C)The man is interviewing Mary.
D) The man wants to talk to Mary.

A) Job opportunities.
B)The meeting schedule.
C)Flights to London.
D)The hotel location.

A)Buy a car for the woman.
B)Show the woman around.
C)Offer the woman a discount.
D)Sell a used car to the woman.