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單項(xiàng)選擇題

We had to learn chemical（）at school but I can only remember H₂O for water.

A.principles
B.prescriptions
C.formula
D.formulae

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單項(xiàng)選擇題

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A.choice
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單項(xiàng)選擇題

After retiring, he（）his hobby of stamp collecting.

A.pursued
B.pursuit
C.followed
D.chased