To reach Africa, we flew high mountains, deep valleys and
great deserts(沙漠).
| A．on, across, though | B．over, through, through |
| C．over, through, across | D．on, in, across |
We know that the Black Sea, one thousand years ago, was a fresh water lake about ________ and unconnected with the Mediterranean.
| A．its two thirds present size | B．two-thirds size of the present |
| C．its two-thirds of the present size | D．two- thirds its present size |
— I’m sorry to hear that some villagers got disabled in the earthquake.
— That’s too bad, but _______.
| A．all is well that ends well | B．the darkest hour is nearest the dawn |
| C．where there is life, there is hope | D．it is good to have friends in trouble |
The Yangtze River, China’s longest, has been affected by a severe drought, ________ the lowest level of rainfall this year since 1961．
| A．with | B．for | C．beyond | D．besides[来 |
Professor Smith, along with his assistants, _________on the project day and night to meet the deadline.
| A．work | B．working | C．is working | D．are working |
There was so serious a matter that I had no choice but _________ the police.
| A．called in | B．calling on | C．call for | D．to call in |