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【简答题】
“ ” 是确定旅客列车运行区段和行车量的基本原则。
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举一反三
【单选题】According to the text, telomeres_____________- .
A.
can make a cell die quickly
B.
can help prevent DNA from separating
C.
become shorter before they die
D.
are at the ends of people’s chromosomes
【简答题】何谓“五行”?其各自的特性是什么?
【多选题】Why do historians disagree? There are three reasons:__________.
A.
The historians read different history books.
B.
Selection of different facts about the same event.
C.
Use of the same facts from different premises.
D.
Analysis of different levels of cause and effect.
【简答题】telomeres
【简答题】telomeres & Telomerase
【单选题】People often wonder why historians go to so much trouble to preserve millions of books, documents and records of the past. Why do we have libraries? What (1)_____ are these documents and the (2)_____ ...
A.
right
B.
good
C.
important
D.
fine
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