填空题

______ (一科学家怀疑这个论断) that organisms degrade with age as an inevitable outcome of living.

【参考答案】

Some scientists are dubious of the claim
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填空题
He could not plead ignorance as his excuse for ______ (他应该知道部门里发生了什么).
单项选择题
According to Ms. Brookover, researching in the stacks and online are different because ______.
A．people do not walk into the library any longer
B．people do not physically holding the article
C．people of sense of author online
D．everything can belong to you easily online
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