The lecture was going well until the projector(幻灯机) ______ and put the professor off his stride.
| A．broke down | B．broke up | C．broke away | D．broke off |
Animals are obviously __________ lower form of life than __________ man.
| A．a; / | B．the; the |
| C．a; the | D．/；/ |
There are over 58, 000 rocky objects in __________ space, about 900 of which could fall down onto __________ earth.
| A．the; the | B．/; the |
| C．the; / | D．a; the |
Experts think that __________ recently discovered painting may be __________ Picasso.
| A．the; / | B．a; the |
| C．a; / | D．the; a |
I woke up with __________ bad headache, yet by __________ evening the pain had gone.
| A．the; the | B．the; an |
| C．a; the | D．a; an |
As is known to all, __________ People's Republic of China is __________ biggest developing country in the world.
| A．the; / | B．the; the |
| C．/; the | D．/；/ |