航空器活动区虽然包括跑道、滑行道、联络道以及周边区域，但进入该区域应当取得（）和（）。
参考答案：特别许可；授权
Zheng He had over 300 ships, _______ some were over 150 meters long and could carry up to 1,000 people.
A．that
B．which
C．of which
D．on which
被世界称为“杂交水稻之父”的我国科学家是 。
