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【单选题】
通过噬菌体为媒介，将供菌体的基因转入受体菌内使之基因改变称为A.
结合
B.
转化
C.
转导
D.
溶原性转换
E.
原生质体融合
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反馈参考答案：
举一反三
【简答题】GIS具有空间分析功能，其中()是GIS应用深化的重要标志。 A空间特征合并 B空间检索 C空间拓扑叠加分析 D空间模型分析
【单选题】The family were enjoying their dinner, so I was wondering if I had arrived at a/an ________ time. [ ]
A.
awkward
B.
prosperous
C.
flexible
D.
particular
【单选题】—That's a great dinner. ______. —Thanks, but it really only took an hour.
A.
I had never had it before!
B.
I enjoyed it very much.
C.
You must have spent all day cooking.
D.
Who cooked it?
【单选题】I _____ her invitation to the dinner party because I had a prior appointment.
A.
rejected
B.
declined
C.
refused
D.
objected
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