It is not known whether. MDMA studies conducted on animals.

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问题 It is not known whether______.
MDMA studies conducted on animals______.

选项 A、show damage to the kidneys
B、cannot provide absolute proof of the effect of the drag on humans
C、are cruel and have been discontinued
D、suggest alcohol and Ecstasy used simultaneously cause death

答案B

解析

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本试题收录于：公共英语四级笔试题库公共英语（PETS）分类

公共英语四级笔试

公共英语（PETS）

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It is not known whether______. MDMA studies conducted on animals______.

公共英语四级笔试

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It is not known whether. MDMA studies conducted on animals.