As more and more cars are produced and used, so the _____ from their exhaust-pipes contains an even larger volume of poisonous gas.
| A．exposure | B．distribution | C．expansion | D．emission |
相关试题
____ in the fields on a March afternoon, he could feel the warmth of spring.
| A．Walking | B．To walk | C．Walked | D．Having walked |
Only when I 
left my parents for America ____ how much I loved them.
| A．I realized | B．I had realized | C．had I realized | D．did I realize |
– I am afraid I can’t return the camera to you before Friday.
– ____.
| A．Not at all | B．Be  careful |
C．Take your time | D．Don’t be afraid |
1. shadeA. behave B. shadowC. considerate D. battle
2. crowdA. slowB. windowC. allowD. row
3. actorA. worth B. therefore C. exportD. doctor
4. reduceA. chemical B. regret C. generationD. intend
5. nutrition A. struggleB. supportC. summaryD. confuse
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