莱茵河流经的最大工业区是[ ]
A、巴黎工业区
B、鲁尔工业区
C、萨尔工业区
D、汉堡工业区
答案:B
下列物质中,能用作氮肥的是( )
A.K2SO4
B.CO(NH2)2
C.K2CO3
D.Ca(H2PO4)2
Hearing the news, she _____________.
A.burst into tears
B.burst into crying
C.burst crying
D.burst of crying.