受地势高低的影响，亚洲河流流向有什么特点[ ]
A．都向北流入北冰洋
B．都向东流入太平洋
C．都向南流入印度洋
D．呈放射状流入四周的海洋
答案：D
把阻值为60Ω的电阻R1与另一个电阻R2连接后，总电阻变为R1的1／3，那么R1和R2是_____联的，R2为_____Ω。
—Did you return from Shanghai on time?
—No. The train________ I took was late because of the bad weather.
A．what
B．who
C．which
D．where
