1 . Eggs, meat, vegetables and other foods can easily be poisoned by microorganisms such as ______.

A．phenomena

B．dilemma

C．diploma

D．bacteria

2 . The accident that happened at an oilfield____ the southeast coast of the U．S．A has caused great damage to the environment.

A．away

B．from

C．beyond

D．off

3 . _______some people come here for a short break, others have decided to stay forever.

A．Because

B．If

C．Once

D．While