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單項(xiàng)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

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When he was a young boy, a serious disease deprived him of the（）of hearing.

A.organ
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Stamping on any country's national flag is an（）to its people.

A.inflation
B.ingredient
C.insult
D.invasion