We should try to help the ____________ because they have an illness which makes it difficult for them to move around.
A:disabled
B:worried
C:moved
Stephen Hawking believes that earth is unlikely to be the only planet life has developed gradually.
—Yes, he does.
网上有新闻说“江西武宁现海市蜃楼,时长近半小时”,“海市蜃楼”之所以会形成是因为光发生了____ .站在地面上的人观看“海市蜃楼”时,还发现水中有楼房的影子,这个“影子”的形成是因为光发生了____ .