题目内容

The ability of coal to release a combustible gas has long been known.

A. submit
B. emit
C. admit
D. permit

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There has been a breakthrough in the identification of cancer genes.

A. success
B. anguish
C. abyss
D. predicament

The costs of the vacation surpassed my expectation.

A. expounded
B. expanded
C. exceeded
D. equaled

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A. disclose
B. expose
C. elect
D. appoint

Every inhabitant here has an obligation to pay taxes.

A. resident
B. president
C. ascendant
D. descendant