下列哪一项为谷疸主症：
A．额上黑
B．食谷即眩
C．心中懊侬
D．手足烦热，薄暮即发
E．心中热痛
参考答案：B
如果零上5℃记作+5℃，那么零下3℃记作（ ）℃．
I'll never understand how it ___ that you were late for class four times within a week ! [ ]
A. came out
B. came across
C. came about
D. came into being
