“Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.”
| A．must; could | B．may; might |
| C．need; must | D．could; need |
252. One of the purposes of United Nations is to achieve international co-operation without distinction as to race,____, language or religion.
| A．sex | B．female | C．male | D．Skin |
251. The America’s selling weapons to Taiwan cast a shadow on the Sino-U.S relationship. Which of the following can explain the underlined part?
| A．was a good omen on | B．had ill effect on | C．was at war with | D．Effected |
250. Every year Harvard University awardsto excellent foreign students in theoretical physics.
| A．bonus | B．scholarships | C．rewards | D．Pensions |
249. A_____ has taught us what atoms are made up of and how powerful the atom bomb is.
| A．seaman | B．salesman | C．naturalist | D．Scientist |
248. A group of the red scarves are playing on the seaside_______.
| A．sand | B．sands | C．sail | D．Salts |