Finding information in today's world is easy.The ________ is how you can tell if the information you get is useful or not.
| A．knowledge | B．ability |
| C．competition | D．challenge |
Don’t turn off the computer before closing all programs，________ you could have problems. (2013·北京，22)
| A．or | B．and |
| C．but | D．so |
I was glad to meet Jenny again，________ I didn’t want to spend all day with her.
(2013·大纲全国，23)
| A．but | B．and |
| C．so | D．or |
She says that she’ll have to close the shop ________ business improves.(2013·江西，28)
| A．if | B．unless |
| C．after | D．when |
Mark needs to learn Chinese________his company is opening a branch in Beijing.
(2013·山东，26)
| A．unless | B．until |
| C．although | D．since |
You must learn to consult your feelings and your reason________you reach any decision. (2013·湖南，23)
| A．although | B．before |
| C．because | D．unless |