A: —I'm ____ (sad; excited) because we're going to climb the mountain.
B: —That's ____(grey; great).
A: —I'm ____(scared; tired).
B: —Why are you scared?
A: —Because she's going into the cave. I heard a____ (toys; noise).
B: —Be careful!
酒精测试仪可检测驾驶员是否酒后驾车,如图甲所示是它的原理图,酒精气体传感器的电阻跟酒精气体浓度的关系如图乙所示.R0是定值电阻.如果测试到的酒精气体浓度越大,那么( )
我国年降水量分布的总趋势是( )
下列各项中加线词的古今异义相同的一项是( )