问题
选择题
Just like fingerprints, each person's DNA is _________ unless he has a twin. [ ]
A. unusual
B. normal
C. various
D. unique
答案
答案：D
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Just like fingerprints, each person's DNA is _________ unless he has a twin. [ ]
A. unusual
B. normal
C. various
D. unique
答案：D
二、根据下面的表格资料回答以下问题
|
全国设有科技机构的企业的数量的变化趋势是( )。
A．一直上升
B．一直下降
C．先上升后下降
D．先下降后上升