【单选题】The direction in which a vessel is steered is the course. The path actually followed is the ______.
D.
course over the ground
【单选题】Had you followed the doctor's advice, you would be much better now. But you ______.
【简答题】职场交往的“私人问题五不问”是指哪几个问题?
【单选题】It’s cloudy. You had better ________ an umbrella.
【简答题】 发酵培养基主要由 __________ 、 _______________ 、 ____________________ 和 ___________________ 组成。