2. 外语
  3. An oyster produces a pearl by coating a grain of sand inside its shell with nacre, a secretion of its body.

An oyster produces a pearl by coating a grain of sand inside its shell with nacre, a secretion of its body.

admin2012-09-29  45
问题 An oyster produces a pearl by coating a grain of sand inside its shell with nacre, a secretion of its body.
选项 A、makes
B、attains
C、binds
D、cures
答案A
解析 制造
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