鸡的孵化期是28天。
参考答案:错
In this lecture, I can only give you a purely_______view of how we can live life to the full and make some suggestions about the future.
A.precious
B.unique
C.different
D.personal
我国人民发现和使用石油的时间为世界最早。始于何时,据稽考,()就已开始。
A.至迟在三千多年前
B.至迟在四千多年前
C.至迟在二千多年前