下图A、B、C、D四处，属于背斜的分别是
A、B和A
B、A和B
C、A和C
D、B和D
答案：C
______this cake, you'll need 2 eggs, 175g sugar and 175g flour.
[ ]
A. Having made
B. Make
C. To make
D. Making
引起溶血性尿毒综合征的是（）
A．ETEC
B．EIEC
C．EPEC
D．EHEC
E．ZAggEC
