我国著名科学家高士其和周培源,年轻时都在美国芝加哥大学求学。有一次,高士其遇到了一个物理难题,他翻阅了许多资料也没有弄懂,便去问周培源。周培源热情地为他讲解,直到他弄明白为止。他俩一直都是这样互相帮助、共同进步,结果双双成为我国著名的科学家。这表明( ) ①他们之间只有合作没有竞争 ②帮助别人就是帮助自己 ③良好的合作创造“双赢” ④竞争并不排斥合作
Pieces of bamboo or wood ________ books between 2nd and 5th century AD. A. used to formedB. used to form C. were used to formD. used to beforming
Washing machines made by China have won ______worldwide attention and Haier has become _____popular name.
Having sent several mails to apply for jobs, Susan waited for a reply, but ___ came.
— What are you going to do this weekend? — _____. If time permits, I may go to Shanghai with my friends.
We ______ the difficulty together, but why didn’t you tell me?