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

解析句意：没有有效护照，旅客被禁止进入一个国家。泅个选项都有“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

ThereareseveralpossibleexplanationsforthegreaterjobstabilityinJapan______thegreatjobmobilityintheUnitedStates.

ThefamilyisthecenterofmosttraditionalAsians’lives.Manypeopleworryabouttheirfamilies’welfare,reputation,andhon

Thisdifferenceappliesalsototheextent______whichpeopleleanoveroneanotherinconversation.

Heisaskedtomakefurtherimprovementsontheproducts______thelightofthefeedbackofthecustomers.

WhichofthefollowingwordscanNOTbeusedtocomplete"Teenager______sheis,shehaspublishedsomebooks."?

Whatcanweknowaboutthemanfromtheconversation?

The6-daynegotiationsbetweenthePLOandIsraelaremainlyabout______

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Theideaoftravelingthrough______spacetootherplanetsinterestsmanypeopletoday.

Thegraduatesexpectedthere______adecentfarewellpartybeforetheirdeparture.

数字仪表中的A／D转换，与A、D相对应的是()。

1956年中共八大提出我国社会的主要矛盾是（）。

某人的无效腔容量为125ml，肺通气量为7500ml／min，呼吸频率为每分钟20次，其心输出量为5000ml时的通气／血流比值应为

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