___ most of the earth’s surface is covered by water, fresh water is very rare and precious.
| A．As | B．Once | C．If | D．Although |
相关试题
They are shocked to find that in this town the traffic rules are not strictly ________.
| A．noticed | B．recommended | C．observed | D．concerned |
How can you expect him to make any progress________you never give him a chance to have a try?
| A．when | B．unless | C．even though | D．until |
---Is there any flight to New York?
--- I think there ______ be, for it is snowing so heavily.
| A．shouldn’t | B．mustn’t | C．can’t | D．needn’t |
---I have some good news for you. You’ve been accepted as a member of our club.
---_____________ That’s great!
| A．Good idea! | B．Pardon? | C．Congratulations! | D．Have I? |
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