读我国局部地区图，完成下列要求。 （1）写出图中字母代表的地理事物名称。 山脉

M: The taxi driver must have been speeding.
W: Well, not really! He crashed into the tree because he was trying not to hit a box that had fallen off the truck ahead of him.
Q: What do we learn about the taxi driver().

A. He turned suddenly and ran into a tree.

B. He was hit by a fallen box from a truck.

C. He drove too fast and crashed into a truck.

D. He was trying to overtake the truck ahead of him.

投资者可以通过买入股票现货，卖出股票价格指数期货，在一定程度上抵消股票价格变动的风险损失。( )

下列抗菌药中，肾衰时无需减量的是

A．复方新诺明

B．庆大霉素

C．卡那霉素

D．头孢氨苄

E．红霉素

下列关于放射性元素的半衰期的几种说法正确的是 [ ]

A．同种放射性元素，在化合物中的半衰期比在单质中长

B．放射性元素的半衰期与元素所处的物理和化学状态无关，它是一个统计规律，只对大量的原子核才适用

C．氡的半衰期是3.8天，若有4 g氡原子核，则经过7.6天就只剩下1 g

D．氡的半衰期是3.8天，若有4个氡原子核，则经过7.6天就只剩下一个

纺织品夹缬与绞缬