Goldfish don't know _______ to them three seconds ago.
A:what happens
B:what is happening
C:what happen
D:what happened
某九年级同学家住5楼.一天,他提着装有30个鸡蛋的塑料袋从1楼走到家里在此过程中,下列估算不合理的是( )
亚洲和北美洲的分界线是 ( )
阅读唐朝诗人武元衡的《春兴》一诗,回答后面的题。杨柳阴阴细雨晴,残花落尽见流莺。 春风一夜吹乡梦,又逐春风到洛城。【注】洛城:武元衡的家乡是在洛阳附近的缑氏县。