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举一反三
【单选题】Mrs. Brown had a small garden behind her house, and in the spring she planted some vegetables in it. She looked after them very carefully, and when summer came they looked very nice. One evening Mrs. ...
A.
Right.
B.
Wrong.
C.
Doesn’t say.
【单选题】人工挖掘土方作业过程中，作业人员相互间必须保持足够的安全距离：前后作业，两人间距不小于(C)m;左右作业，两人间距不小于( )m。
A.
1;
B.
2;
C.
3;
D.
4;
E.
5;