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單項選擇題

The noise was so faint that you had to（）your ears to hear it.

A.stir
B.strengthen
C.strain
D.stride

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單項選擇題

The manufacturers refused to take all（）for damage caused by misuse.

A.duty
B.responsibility
C.obligation
D.share

單項選擇題

If you（）bright sunlight（）dry wood with a glass, it will start burning.

A.expose；to
B.concentrate；on
C.aim；at
D.focus；on