题目内容

Haley studied her, an enigmatic smile on his face."enigmatic" means:

A. happy
B. subtle
C. mysterious

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Based on their researches on heart diseases, cardiologists now advise people to exercise more."cardiologists" means:

A. heart specialists
B. sports trainers
C. social researchers

Ivory trade is one of Africa's oldest, most lucrative, and now most debatable export trades."lucrative" means:

A. profitable
B. productive
C. proficient

His mother raised him alone, fostering his interest in arts."fostering" means:

A. guiding
B. discovering
C. nurturing

The survey showed that the largest fraction of the country's energy supply is furnished by petroleum."fraction" means:

A. base or foundation
B. part or section
C. source or origin

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