一战是人类历史的一次浩劫。它爆发的标志是( )
A:奥匈帝国向塞尔维亚宣战
B:德国向塞尔维亚宣战
C:萨拉热窝事件的发生
D:两大军事集团矛盾的激化
日本发展工业的不利条件是( )
cooked , was , tired , visited, washed , cleaned , in , goes , told , next
My mother____busy last weekend . She____my grandma on Saturday m orning . They ____noodle together____the evening , she ____the clothes . She often____to the park, but she____my bedroom last Su nday. In the a fternoon , she went shopping . After supper , she ____stories for me .She was very ____last weekend . So I will help my mother do housework ____ weekend.
已知一个命题P(k),k=2n(n∈N),若n =1,2,…,1000时,P(k)成立,且当n=1000+1时它也成立,下列判断中,正确的是( )