【判断题】人体所需要的营养素有:蛋白质、脂肪、碳水化合物、矿物质、微量元素、维生素和水。()
【单选题】B2C电子商务是按照以下哪个标准分类的结果:
【单选题】For ______ football players, injuries are an occupational hazard which seems unaviodable.
【单选题】The main idea of this passage is that______.
A.
culture shock is an occupational disease
B.
culture shock is caused by the anxiety of living in a strange culture
C.
culture shock has peculiar symptoms
D.
it is very hard to cope with life in a new setting
【多选题】共鸣器官根据体积的固定性和灵活性,分为可调节共鸣器和不可调节共鸣器。其中以下选项属于可调节共鸣器的是()。