对传染病流行过程有决定性影响的因素是A．病毒数量B．社会因素C．自然因素D．病毒侵袭力E．毒力

The villagers, ______ had been washed by the flood, called in people's aid.

A．all of whose properties

B．all their properties

C．all whose properties

D．all of their properties

The villagers,______had been washed by the flood, called in people's aid.

A．all of whose properties

B．all their properties

C．all whose properties

D．all of their properties

A．having destroyed

B．were destroyed

C．having been destroyed

D．have been destroyed

______ the PLA men the villagers would not have survived the flood.

A．It had not been for

B．Had it not been for

C．Were it not for

D．Has it not been for

______ the PLA men the villagers would not have survived the flood. ()

A．It had not been for

B．Had it not been for

C．Were it not for

D．Has it not been for

A．having destroyed

B．were destroyed

C．having been destroyed

D．have been destroyed

After the flood, the villagers are trying their best to get thing back to ______.

A．ordinary

B．normal

C．common

D．usual

The residents, ______ had been damaged by the flood, were given help by the Red Cross.

A．all their homes

B．all of whose homes

C．whose all home

D．all of their homes