“中低压”和“中气旋”的主要区别是在（）上，前者没有明显的（）式环流。
参考答案：风场；气旋
下列物质中不含矿质元素的是[ ]
A．蛋白质和水
B．糖类和水
C．蛋白质和糖类
D．脂肪和核酸
He is not native, if he were, we _______ this discussion over his identity.
A．would not be having
B．are not having
C．had not had
D．will not have
