Los Angeles Times reported that researchers may have found a way to ______ human life by changing certain genes, so that humans might expect to live twice as long.
| A．extend | B．preserve |
| C．multiply | D．transform |
.
—— The plane will take off in half an hour. I’m afraid I must be going now.
—OK. ________.
| A．See you | B．Go slowly | C．Stay longer | D．Take it easy |
.
The boy often gives a satisfactory answer to the teacher’s question, _____ just a minute. So he’s usually the teacher’s pet.
| A．thought | B．having thought | C．and to think | D．thinking |
.
Learning experiences happen to us throughout our lives, and not too long ago, I had______ that I would like to share.
| A．it | B．one | C．that | D．this |
.
“There is a great potential for the development of Sino-U.S. trade, ______ is in line with the interests of the two countries and their people,” Wu said
| A．which | B．who | C．that | D．as |
.
The talk between the two leaders aimed at ending the long _____of war between the two countries.
| A．sense | B．case | C．state | D．condition |