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【单选题】
绿叶海天牛(简称甲)吸食滨海无隔藻(简称乙)后,身体就逐渐变绿,这些 “ 夺来 ” 的叶绿体能够在甲体内长期稳定存在,有科学家推测其原因是在甲的染色体 DNA 上可能存在乙编码叶绿体部分蛋白的核基因。为证实上述推测,以这种变绿的甲为材料进行实验,方法和结果最能支持上述推测的是A.
通过 PCR 技术从甲体内的 DNA 中克隆出属于乙的编码叶绿体蛋白的核基因
B.
通过核酸分子杂交技术，在甲体内检测到乙的编码叶绿体蛋白的核基因转录出的 RNA
C.
给甲提供 14 CO 2 ，一段时间后检测到其体内的部分有机物出现放射性
D.
用乙编码叶绿体蛋白的核基因做探针与甲的染色体 DNA 杂交，结果显示出杂交带
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举一反三
【单选题】We should ______ when using serf-talk.
A.
keep positive serf-talk as much as possible
B.
avoid negative serf-talk whenever possible
C.
keep a balance between positive and negative serf-talk
D.
remind ourselves of the advantages of all serf-talk
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A.
正确
B.
错误
【判断题】After the counterpart's quotation, we should avoid by all means bothering, listen attentively to, question carefully to clarify, sum-up and retell to make sure that what we heard and understand is exa...
A.
正确
B.
错误
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