Science has given clear evidence ______ smoking can lead to many diseases.
| A．what | B．which | C．that | D．where |
Distance education programsthe disadvantages of limited time, distance or physical disability, so they are becoming more and more popular all over the world.
| A．come up with | B．consist of |
| C．account for | D．make up for |
A New York couple have been killed in a car crash on their way to hospital，but the unborn baby________ the accident.
| A．experienced | B．survived |
| C．escaped | D．fled |
________that the government can clear up official corruption，we are________ about the future of our country.
| A．Convinced；optimistic | B．Convincing；optimistic |
| C．Convinced；pessimistic | D．Convincing；pessimistic |
General Secretary，Xi Jinping stressed that cross－strait cooperation would be strengthened________ the two sides could agree to oppose Taiwan independence.
| A．as long as | B．even if | C．unless | D．until |
Little _______ that the region was rich in natural resources about four decades ago.
| A．we did know | B．knew we | C．did we know | D．we knew |