—Could I speak to Miss Smith, please?
—______． She’s gone to the post office．
| A．I’m afraid not | B．I think so | C．Certainly you can. | D．I’m not sure． |
Now the Internet is a popular channelthe public voice their opinions and show their strength.
| A．by that | B．through which | C．through that | D．by which |
Since the opening and reform policy, Chinaa boom in its economy.
| A．enjoys | B．has been enjoying | C．enjoyed | D．having enjoyed |
private cars are bringing us convenience, they may also cause traffic accidents and pollution.
| A．When | B．Since | C．while | D．As |
Nowadays, many people walk to work, Copenhagen（哥本哈根）Conference calling for living a low-carbon life to cope with global warming.
| A．in relation to | B．in terms of | C．in apposition to | D．in response to |
He has been working hard day and night, which, of course,his tiredness.
| A．accounts for | B．answers for | C．applies for | D．stands for |