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【单选题】
A mutant of E. coli with a heat-sensitive DNA ligase (25℃ permissive, 37℃ nonpermissive) has been used to show that DNA synthesis is discontinuous. Examination of DNA replication in the presence of [3H]-thymidine in the mutant would demonstrate which of following?A.
The accumulation of short segments of unlabeled DNA at 25 ℃ and at 37 ℃ .
B.
The accumulation of short segments of unlabeled DNA at 25 ℃ but not at 37 ℃ .
C.
The accumulation of short segments of radioactive DNA at 37 ℃ but not at 25 ℃.
D.
The incorporation of short fragments of radioactive DNA into longer ones at 25 ℃ and at 37 ℃ .
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【单选题】The model plane was made by a _______ boy.
A.
ten-years-old
B.
ten-year old
C.
ten-year-old
【简答题】彩泥的基本手法有哪些?并尝试做出来。
【简答题】党的十八届提出五大发展理念，新发展理念符合我国国情，顺应时代要求，在理论和时间上有新的突破，对破解发展难题、增强发展动力具有重大指导意义。如何理解坚持以人民为中心的发展思想？
【单选题】The model plane was made by a ____ boy.
A.
ten-years-old
B.
ten-year-older
C.
ten-year-old
D.
ten-year old
【简答题】The
model plane was made by a ___ boy.A. ten-years-old B. ten-year-older C. ten-year-old D. ten-year
old
【单选题】The model plane isn’t as nice as my partner’s, but it was made by myself.
A.
at last
B.
at least
C.
at times
D.
at present
【简答题】I saw that the boy was a model plane. I saw the boy ___________ a model plane.
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