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【单选题】
女，28岁，平时月经规则，现停经2月，有恶心呕吐。昨日有少量阴道流血，轻微腹痛。检查：宫颈着色，宫颈口闭，前倾，2月妊娠大小，质软，活动，压痛，附件未及异常，尿妊娠试验阳性，超声见宫腔内有孕囊，可见胎心搏动，临床诊断是A.
难免流产
B.
先兆流产
C.
宫外孕
D.
不全流产
E.
妊娠滋养细胞疾病
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【单选题】Why is even a single disease-causing bacterium dangerous?
A.
It can mix with other bacteria.
B.
It can become billions in a day.
C.
Just one can kill a six-year-old child.
D.
It can move more rapidly alone.
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A.
method of agreement
B.
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C.
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D.
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【单选题】Synthetic biology provides technical support for reviving and constructing from scratch dangerous bacteria or viruses such as Ebola, Smallpox and SARS viruses that can kill people in mass easily; this...
A.
biosecurity
B.
biosafety
C.
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D.
bioproduct
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