题目内容
(2013·山东，28)________I have to give a speech，I get extremely nervous before I start.
| A．Whatever | B．Whenever | C．Whoever | D．However |
B
解析
优化作业上海科技文献出版社系列答案China is developing fast. That's ________ I think those of my colleagues who deal with China affairs should visit China.
| A．because | B．why |
| C．when | D．how |
A man cannot smile like a child，________ a child smiles with his eyes，while a man smiles with his lips alone.
| A．so | B．but | C．and | D．for |
(2010·新课标全国)Mary made coffee ________ her guests were finishing their meal.
| A．so that | B．although | C．while | D．as if |
(2013·湖南，23)You must learn to consult your feelings and your reason________you reach any decision.
| A．although | B．before | C．because | D．unless |
It is pretty well understood ________ controls the flow of carbon dioxide in and out the atmosphere today.
| A．that | B．when | C．what | D．how |
(2010·安徽)It was from only a few supplies that she had bought in the village ________ the hostess cooked such a nice dinner.
| A．where | B．that | C．when | D．which |
There is still much to discuss；________，we shall return to this topic at the next meeting.
| A．yet | B．therefore |
| C．otherwise | D．however |
Portia，for ________ physics had once been very hard，turned out to be a physicist.
| A．whom | B．whose | C．that | D．which |