Though buried in the ruins for about 70 hours after the earthquake, with great luck, the man managed to______.
| A．recover | B．exist | C．survive | D．rescue |
The United Nations is trying to free the world________the threat of war.
| A．at | B．in |
| C．by | D．from |
Traffic conditions in Beijing________for decades.At first people only complained about jams during rush hours，but today every hour is rush hour.
| A．is worsening | B．have worsened |
| C．have been worsening | D．worsened |
It is difficult for children to change their eating habit later in life.________，parents should encourage healthy eating from an early age.
| A．Otherwise | B．Therefore |
| C．Besides | D．However |
It is well known that knowledge is________treasure house，but practice is________key to it.
| A．a；the | B．the；the |
| C．a；/ | D．/；the |
The young man was modest and worked hard，and gradually managed to________his status.
| A．take up | B．bring up |
| C．build up | D．put up |