The number of deaths from heart disease will be reduced greatly if people ______to eat more fruit and

vegetables.[ ]

A. persuaded

B. will persuade

C. be persuaded

D. are persuaded

点燃天然气火头时，应按（）的次序操作。

A.先开气，后点火

B.先点火，后开气

C.开气与点火同时进行

D.操作次序无规定