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【单选题】
核苷酸是核酸的基本结构，组成部分为A.
碱基、戊糖、磷酸
B.
核苷、戊糖、磷酸
C.
碱基、戊糖、硫酸
D.
碱基、核苷、磷酸
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举一反三
【单选题】May I ask _______? Maybe I can help you find it.
A.
what are you looking for
B.
what you are looking for
C.
what you are looking
【单选题】Whom are you looking for? I am looking for ( )
A.
an instruction book
B.
plan
C.
your chief engineer
【简答题】When I was young, I wanted to be a teacher if I grew up，simply because I wanted to write on the chalkboard！My teachers seemed to be the 36 printers，curving their letters just so，and I wanted to do it ...
【单选题】I______to be a scientist when I______ a boy.
A.
wanted, was
B.
want, am
C.
wanted, am
D.
want, was
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