世界上琥珀的主要产地有哪些国家？我国琥珀主要产于哪里？
参考答案：波罗的海沿岸国家：俄罗斯、波兰、德国、丹麦；抚顺
There is no________ that students will listen attentively in class, if they are _____ The World Cup in South Africa at night
A．probability ; accustomed to
B．possibility ; addicted to
C．need ; drunk with
D．chance ; familiar with
降低功率因数，使供电设备的供电能力提高
