A:明信片被弹飞后,鸡蛋掉入水中是由于鸡蛋受到重力
B:明信片被弹飞,说明力能改变物体的运动状态
C:明信片被弹飞时,鸡蛋没有随明信片一起飞出去是由于鸡蛋具有惯性
D:明信片被弹飞前,鸡蛋对明信片的压力和明信片对鸡蛋的支持力是一对平衡力
“You are my best friend.” It’s the nicest thing you can 1to someone. It’s also the nicest thing you can 2 someone.Good friendships begin in middle school. It’s the 3you begin to develop your own personality. Your parents aren’t around so you 4 lots of time every day sharing your life with your classmates. You talk with them, you work with them and you become friends with them. But 5 them will become your “best” friend. Best friends are the people who like you and 6 you the most. They are the 7 who are easy to work with and easy to have fun with. Sometimes it‘s 8 to find a best friend. And sometimes you can 9 a little lonely. But just because you don’t have best friend now, it doesn’t mean you 10one in the future. Best friends seem to find each other as if by magic. And when you find your best friend, the magic will last forever.
云南省文山市是我国特有名贵中药材田七的主产地,虽在湿润地区,但对田七生长(3~5月)来说却常常缺水,主要原因是( )