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【单选题】
I called Hannah many times yesterday evening，but I couldn't get through. Her brother_____ on the phone all the time!A.
was talking
B.
has been talking
C.
has talked
D.
talked
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举一反三
【单选题】It is generally believed that ______a piece of field is, ______ it produces. [ ]
A.
the more fertile; the higher output of grain
B.
more fertile; more output of grain
C.
the fertile; t he higher output of grain
D.
the fertile; the more grain output
【单选题】王老师在教学过程中对不同年级的学生分别给予不同的指导,使每个学生都得到发展。王老师的做法符合学生身心发展的()特征。
A.
稳定性和可变性
B.
不均衡性
C.
阶段性
D.
差异性
【单选题】The U.S. has vast expanses of fertile soil that is suited to______.
A.
developing highways
B.
digging wells
C.
growing crops
D.
raising cattle
【简答题】已知路由器Rl的路由表如4-28表所示。试画出各网络和必要的路由器的连接拓扑，标注出必要的IP地址和接口，对不能确定的情况应当指明。
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