信息分析工作中选题时应遵循什么原则？
参考答案：
选题原则；政策性原则；必要性原则；可行性原则；效益性原则
4公顷600平方米=______公顷．
After he graduated from college, he _______ his father’s business.
A．took in
B．took up
C．took over
D．took on
