草坪土壤耕翻一般在施肥与施农药之前进行。疏松的土壤有利于草坪对肥、药的吸收。( )
参考答案：错
下列化合物中氮元素只具有还原性的是
A．
B．
C．
D．
It is usually warm in my hometown in March, but it ______ be rather cold sometimes.
A．must
B．can
C．should
D．would
