Exploring _____space is exciting, yet dangerous.
There is _____need for both robots and humans for space exploration.
| A．the; a | B．a; a | C．/; a | D．/; the |
相关试题
----Honey, let’s go out for dinner.
-----I don’t have to cook.
| A．Forgot it! | B．That’s great! | C．Why? | D．Go ahead! |
—I'd rather have some wine, if you don't mind.
— ________. Don't forget you will drive.
| A．Anything but that | B．By all means |
| C．Take it easy | D．I won't say no to this |
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