2. 外语
  3. ______ are chiefly derived from petroleum.

______ are chiefly derived from petroleum.

admin2004-12-30  39
问题 ______ are chiefly derived from petroleum.
选项 A、Plastics today
B、There are plastics today
C、Because today plastics today
D、Due to plastics today
答案A
解析
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