To prevent the spread of fire by conduction, you should ______.A.cool the bulkheads around

A.spray

B.sprinkle

C.sprea

D.sprout

The writer says that travel was important in the past because it_____.

A．was a way of spreading ideas

B．broke down political barriers

C．led to economic progress

D．made new ideas less schooling

Why will battery buses cost less than conventional buses in the long run？

A．They will spread the capital cost over a long period.

B．They will be stronger and last longer.

C．They will use less fuel and cost less to maintain.

D．They will be charged at night when electricity costs less.

People create viruses in this order:______.

A．write the code — test it — make sure it spreads properly

B．release the virus — test it — make sure it spreads properly

C．make sure it spreads properly — lest it — release the viruses

Why will battery buses cost less than conventional buses in the long run？

A．They will spread the capital cost over a long period

B．They will be stronger and last longer.

C．They will use less fuel and cost less to maintain.

D．They will be charged at night when electricity costs less.

A.保护

B.回收

C.预防

The meeting is for the ______purpose of discussing how to prevent crime.

A．detailed

B．specific

C．limited

D．sophisticated