According to scientists, our mental abilities begin to____ from the age of 27 after reaching the highest level at 22.
| A．differ | B．shrink | C．fail | D．decline |
The new building _____ at the end of this year _____ to that university.
A. be completed; belongs B being completed; is belonging
C. to be completed; belongs D. completed; is belonged
The purpose of the campaign is to raise the public’s_______ of the dangers of passive smoking.
| A．existence | B．connection | C．awareness | D．consciousness |
A recent study has come up with _____ unexpected conclusion that ____ Africa elephants should be divided into two different species.
| A．a, the | B．an, the | C．an, an | D．the, the |
On Halloween, children in American like to _____ as ghosts to frighten people.
| A．dress up | B．put on | C．make up | D．spy on |
No one but the experts in this field can _____ the difference between them.
| A．recognize | B．speak | C．spot | D．predict |