As more and more cars are produced and used, so the _____ from their exhaust-pipes contains an even larger volume of poisonous gas.

As more and more cars are produced and used, so the _____ from their exhaust-pipes contains an even larger volume of poisonous gas.

#6921

exposure

distribution

expansion

emission

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Four years had passed, and I found Mary had＿＿＿＿＿．

#7203

little white hair

some white hair

much white hairs

a few white hairs

Nowadays people have to pass various tests for professional __________ so that they can be qualified for a well-paid job.

#6940

certificates

permission

admission

perseverance

David gave us a vivid            of his trip to Mount Huangshan after his return.

#6259

account

explanation

imagination

idea

Mr. Brown knows little Japanese，so he can't understand the ________ on the bottle of the pills.

#5736

explanations

instructions

suggestions

introductions

There are three ____ doing research work in the company.

#7341

women scientist

woman scientist

woman scientists

women scientists

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