2. 外语
  3. After they tested the chemical and biological ______ of the samples we had sent them, they wrote up the report.

After they tested the chemical and biological ______ of the samples we had sent them, they wrote up the report.

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问题 After they tested the chemical and biological ______ of the samples we had sent them, they wrote up the report.
选项 A、assets
B、characters
C、abnormities
D、properties
答案D
解析
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