题目内容

The two most important ________ in making a cake are flour and sugar.

A elements
B components
C ingredients
D constituents

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No one imagined that the apparently ________ businessman was really a criminal.

A respective
B respectable
C respectful
D realistic

If nothing is done to protect the environment, millions of spiders that are alive today will have become ________.

A deteriorated
B degenerated
C suppressed
D extinct

The ________ of the scientific attitude is that the human mind can succeed in understanding the universe.

A essence
B texture
C content
D threshold

The old lady has developed a ________ cough which cannot be cured completely in a short time.

A perpetual
B permanent
C chronic
D sustained

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