【推荐1】It is generally believed that Watson and Crick’s discovery about DNA was ____ beginning of _____ enormous advances in _____ field of genetics.

A．the, the, the

B．/, /, the

C．the, /, the

D．the, the, a

【推荐2】My father walks dog after      supper every day.

A．a; the

B．/; /

C．the; the

D．the; /

【推荐3】 21. —Would you mind giving your advice on how to improve our business management?
—If you make _______ most of the equipment, there will be ______ rise in production.

A．不填；不填

B．the；a

C．不填；a

D．the；不填