欧泊的色斑呈现为（）。
A.二维片状
B.二维柱状
C.三维片状
D.三维柱状
参考答案：A
科学发展观的核心是（ ）
A．发展
B．全面协调可持续
C．以人为本
D．统筹兼顾
On Friday, we were packing to leave for a weekend away __ my daughter heard cries for help.
A．after
B．while
C．since
D．when
