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【单选题】
生态文明是人类文明的一部分，生态问题具有（），解决生态危机对人类的威胁和挑战，需要全世界的共同努力。A.
长远性
B.
反复性
C.
全球性
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【单选题】DNA疫苗是用病原微生物中一段编码抗原的基因制成，这段基因编码的产物能诱导机体产生免疫反应，以下关于DNA疫苗的叙述正确的是 [ ]
A.
该疫苗引起人体特异性免疫的原因是DNA上具有抗原决定簇
B.
DNA疫苗引起免疫反应后淋巴细胞的细胞周期变长
C.
DNA疫苗在人体内直接表达为抗体，起到免疫作用
D.
DNA疫苗引起免疫反应前必须经过转录和翻译过程
【单选题】Which of the following statements is true?
A.
When the weather became cool, he went down the mountain and started writing books and articles.
B.
When the weather was hot, he went up the mountain and began writing.
C.
When the weather was cool, he took long walks on the mountain trails.
D.
He liked to walk in the cool evening, thinking about his experiments.
【简答题】霍乱染疫、染疫嫌疑船舶应如何实施卫生处理?
【单选题】As winter ______ the weather became colder.
A.
appeared
B.
severed
C.
started
D.
approached
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