第一次世界大战爆发的根本原因是( )
A:萨拉热窝事件
B:三国同盟和三国协约之间相互争夺殖民地和势力范围
C:奥匈帝国对塞尔维亚宣战
D:帝国主义国家之间政治经济发展的不平衡
我国下列科技成就取得成功的先后顺序是( )①原子弹爆炸成功②中近程地地导弹飞行实验成功③人造地球卫星发射成功④无人飞船上天⑤籼型杂交水稻培育成功
根据句意和所给的首字母完成单词(1)In most parts of China, students r____ bikes to school.(2) My family will take the t____ to Beijing next week.(3) It's around 1,500 k____ from Beijing to Tianjin.(4) They had a q____ meal and then went to school in a hurry.(5) She is i____ in hospital. Let's go to see her after school.(6)The e____ bird catches the worm.(7)There is no m____ of getting there. (8) English is a b____ to the world.(9)We must be in the same b____ to overcome the difficulty.(10)Whether(是否) we'll go for a picnic d____ on the weather.