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【单选题】
不属于常规绝灭的原因的是( )A.
物种的内在原因
B.
生存斗争
C.
过度繁殖
D.
隔离
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反馈参考答案：
举一反三
【单选题】小学生通过认识乌鸦、麻雀、燕子等,概括出'鸟'的本质特征这一思维形式是( ). A.推理
A.
小学生通过认识乌鸦、麻雀、燕子等,概括出"鸟"的本质特征这一思维形式是( ). A.推理
B.
判断
C.
综合
D.
概念
【单选题】We must find a room .
A.
which puts the instrument
B.
which to put the instrument
C.
to put the instrument in
D.
to put the instrument for
【单选题】Most of the big hotels were full at this time of the year, but finally we _____ find a room in one of those small guesthouses near the station. [ ]
A.
ought to
B.
could
C.
were able to
D.
might
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