He knows China very well. That is，he has__ good understanding of___ Chinese history.
| A．／；the | B．／；／ | C．a；a | D．a；／ |
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 |
Could I do some explanations? Ito call on you last night, but somebody came to see me just when I was to about leave.
| A．would intend | B．intended | C．had intended | D．was intending |
His parents, , didn’t look after him very well—the elbows of his jacket and his boots were badly worn out.
| A．generally | B．apparently | C．gradually | D．precisely |
After months of voyage, Columbus arrived inlater proved a new continent.
| A．what | B．where | C．that | D．which |