Without a (an)______passport a tourist is forbidden to enter a country.

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问题 Without a (an)______passport a tourist is forbidden to enter a country.

选项 A、operative
B、effective
C、valid D.’ efficient

答案C

解析此题考查形容词的词义。四个选项都有“有效”的意思，但它们的含义有所不同。valid意为“有效的，合法的”，通常指证件等合法、有效；operative指法津、法规，规定等“有效的”；effective常指方法或措施有效，强调能达到预期效果；efficient可以指人有能力或指某方法有效，强调“通过最短的时间和最少的精力达到预期效果。”因此C为正确选项。

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专业英语四级

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Without a (an)______passport a tourist is forbidden to enter a country.

专业英语四级

Thetwochildren______towardstheseaatabout11o’clock.

Theevolutionofhumanbeingscannotbethoughtofas______inashortperiodoftime.

WhichofthefollowingFrenchPresidentJacqueChiracdoesNOTinsiston

Thosesuperiorstatesofminddonotcomefrom______analienculture.

Withallitsadvantages,theartificialintelligenceisbynomeanswithoutits______.

Thoughshedidnotwishforamedicalprofession,Miriamdidnotsayanythingand_______toherparents’wishes.

Educationistooimportanttotake【C1】______,whenpeopletakeanythingforseriously,theyput【C2】______blinderswhichcaus

Biologically,thereisonlyonequalitywhichdistinguishesusfromanimals:theabilitytolaugh.Inauniversewhichappears

FaceScannerThroughoutthenationandtheworld,thedebateontheprivacyimplicationsoffacerecognitionandothersurv

1BAGHDAD,Iraq(CNNThursday,May13,2004)--DefenseSecretaryDonaldRumsfeldThursdayarrivedintheIraqicapitalonasur

函数的定义域为_________．

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