不定项选择

未培养微生物是指迄今为止采用微生物纯培养分离、培养方法还未获得纯培养的微生物。

A．错误
B．正确

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单项选择题

“珍藏”的用法正确的是（）
A、这个茶杯有一百多年的历史，特别珍藏。
B、这坛酒已经珍藏了五十年了。
C、大熊猫是中国的珍藏动物。
D、这种汽车已经非常少了，所以十分珍藏。

单项选择题

As your textbook explains, we continue to find commemorative speeches like the Gettysburg Address meaningful and inspiring primarily because __________. A.
of their eloquent use of language B.
they were delivered from memory C.
of the occasions on which they were delivered D.
they motivated people to take heroic action