What the science teacher does and says of great importance to college students.
| A．are | B．is | C．were | D．was |
Scientists are convinced _ the positive effect of laughterphysical
and mental health.
| A．of; at |
| B．by; in |
| C．of; on |
| D．on; at |
--- Smoking is bad for your health.
--- Yes, I know. But I can’t.
| A．give it up |
| B．give it in |
| C．give it out |
| D．give it away |
--- What’s wrong with Mr. Brown?
--- He said he would come at nine, but he didn’tat that time.
| A．show off |
| B．show up |
| C．take up |
| D．make up |
--- Has Ying Mei said sorry to you?
--- No, She hasn’t given me any explanation .
| A．up to this day |
| B．soon after |
| C．so far |
| D．as long as |
--- I’m afraid it’s too dear.
--- OK, then I’Il take 10% .
| A．up |
| B．off |
| C．away |
| D．down |