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【单选题】
2017年初,我国科学家完成了酿酒酵母16条染色体中的4条的人工合成,开启了人类“设计生命、再造生命和重塑生命”的新纪元。下列有关分析正确的是( )A.
正常情况下,酿酒酵母细胞可能会出现32个以上的DNA分子
B.
姐妹染色单体中含一个亲代DNA分子和一个子代DNA分子
C.
人工合成染色体,需要核苷酸、氨基酸、磷脂和ATP等原料
D.
酵母菌细胞有复杂的生物膜系统,氨基酸的脱水缩合在此进行
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【单选题】According to the passage, which is true of the school children?
A.
They prefer reading to watching TV.
B.
They like watching TV only after school.
C.
They would rather watch TV than read books.
D.
They like their teachers who teach them reading.
【单选题】According to the passage, which is true of the school children?
A.
They prefer reading to watching TV.
B.
They take watching TV only after school.
C.
They would rather watch TV than read books.
D.
They like their teachers who teach them reading.
【简答题】A．Because they can't afford to. B．Because they prefer the apartments near their workplace. C．Because a mobile home is more convenient as they move from place to place. D．Because small houses are easy ...
【单选题】Which of the statements is true of gorillas?
A.
They prefer to stay near their home.
B.
They move from place to place within a limited area.
C.
They are followed when they travel by other animals.
D.
They move around looking for food according to a fairly regular pattern.
【单选题】Generally, senior citizens enjoy their and they prefer to live on their own _________ they can.
A.
as long as
B.
as far as
C.
now that
D.
even though
【简答题】A．They prefer the small town in the United States to big cities in England. B．They live a quiet, enjoyable, and healthy life in the small town. C．They have many acquaintances in the neighborhood. D．Th...
【简答题】列管式换热器在停车时,应先停( ),后停(
)A. 热流体冷流体 B. 冷流体热流体 C. 无法确定 D. 同时停止
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