46. Diamonds are very expensive for several reasons.
(A) First, they are difficult to find; they are only
found in a few places in the world.
(B) You can find a lot of advertisements for diamonds these
days in Taiwan.
(C) In addition, they are useful; people use diamonds to cut other stones. Finally,
diamonds do not change and they are very beautiful.
(D) They stay shining for millions of years.
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