Fleming discovered penicillin almost by______.A．experimentB．handC．accidentD．theo

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Fleming discovered penicillin almost by______.

A．experiment

B．hand

C．accident

D．theory

答案

解析

略

举一反三

On Feb. 6, Xi’an – Zhenzhou High – Speed Railway,_________first high – speed railway in_______West China, was put into operation.

A．不填；the

B．the; the

C．the; 不填

D．不填；不填

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The woman scientist was so busy that she could hardly_______ time to her children.

A．spend

B．devote

C．offer

D．provide

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--- I’ve told her many times, and she still forgot about it!
--- I understand. It’s true that she_______be very forgetful sometimes.

A．can

B．would

C．should

D．must

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She thought _______impossible to finish so much work in a day.

A．this

B．that

C．its

D．it

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It is becoming more and more difficult to_______the problems of traffic in some big cities of our country.

A．deal with

B．set up

C．put away

D．break down

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