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【单选题】
下列选项属于基本词特点的是A.
基础性
B.
灵活性
C.
丰富性
D.
稳定性
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反馈参考答案：
举一反三
【单选题】It’s _______ MP5 . It can be used to listen music and watch movies . It’s ________ useful invention .
A.
a ; a
B.
a ; an
C.
an ; a
D.
an ; an
【简答题】A．It's author is unknown. B．It's useful as a teaching tool. C．It uses an extensive vocabulary. D．Children find it repetitive and boring:
【单选题】—What's your favorite subject? —English. I like it very much ______ it's interesting and useful. [ ]
A.
when
B.
after
C.
if
D.
because
【简答题】()的排列顺序千变万化确定了遗传信息的多样性。
【单选题】There is _______ 'u' and _______ 's' in the word “useful”. [ ]
A.
an, a
B.
a, an
C.
a, a
D.
an, an
【单选题】There is _______ 'u' and _______ 's' in the word 'useful'. [ ]
A.
a; an
B.
a; a
C.
an ; an
D.
an; a
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