We do not know how astronauts can ________ when they spend months in space without the protection of the atmosphere.
| A．get off | B．get up | C．get along | D．get in |
Marco Polo is said to have sailed on __________ Pacific Ocean on his way to Java in __________ thirteenth century.
| A．the; a | B．a; / |
| C．/; the | D．the; the |
It was __________ cold winter night and the moon was shining brightly across __________ night sky.
| A．/; a | B．a; the |
| C．the; a | D．the; / |
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 |