The best times to visit Shangri-la are spring and autumn ____ the temperature is at its mildest.
| A．when | B．where | C．that | D．which |
From facts, scientists have that more energy is being absorbed from the sun, throwing the earth’s energy “out of balance”.
| A．confirmed | B．concluded | C．concentrated | D．centred |
The first edition in 1955 and a best seller ever since.
| A．was published; had been |
| B．had been published; had been |
| C．has been published; has been |
| D．was published; has been |
— I am going to be a volunteer at the Asian Games to be held in Guangzhou this November．
—! Me, too.
| A．That’s it | B．Good luck | C．No problem | D．That’s great |
Learning foreign languages calls for your memory,time,patience and emotions._______,it is not a simple thing.
| A．As a result | B．In conclusion | C．In general | D．After all |
Private cars are required to take turns off roads one out of five weekdays ____the traffic pressure.
| A．relieve（缓解） | B．to relieve | C．relieving | D．relieved |