单项选择题

The scientist's work was based on _______.

A．occasional observations
B．systematic observations
C．observations of several nests
D．observations of undisturbed nests
<上一题 目录 下一题>
热门 试题

单项选择题
The underlined expression step back in time at least a hundred years ( Para. 2 ) is intended to convey the idea that ______.
A．college classrooms often remind people of their cortege life
B．critical thinking was encouraged even a century ago
C．a hundred years ago, desk arrangement in a classroom was quite different
D．there is not much change in the college educational idea over the past hundred years
单项选择题
The underlined word good (Para. 3) refers to ants'_______ .
A．co-operation in working
B．sense of responsibility
C．efficiency in working
D．willingness to work hard
相关试题