①斯塔笛家并不丰富，卖不起多少书，可他把用心积累起来的每一个铜子儿，都花在了书店里
②队员们使劲抓住绳子用力向后使劲拉着。
③同学们全都聚精会神全神贯注地注视着老师拿着手上的杯子。
下列关于我国民族分布特点的叙述，正确的是（ ）
下列哪一项不是抑制植物呼吸作用的农业生产措施？（ ）
在初中即将毕业之际, 请你以张明的名义给英国笔友Brian写一封感谢信, 要点提示如下：
three years ago
a new comer, have no friends and feel lonely…..
During three years
Brain have written many letters to help you in different ways:
Encourage you to make more friends.
Tell you the ways how to learn English well
…….
You have changed a lot, for example, ……..
invite him to come to Hangzhou to pay a visit…….
要求：
①词数：80--100个
②信的开头和结尾已给出, 不计入总词数
③要点齐全, 行文连贯, 可适当发挥
Dear Brian,
How time flies! We have been friends for three years. I'm writing to thank you for your help!
Three years ago, ……
Hope to see you soon!
Yours,
Zhang Ming
在正方体ABCD﹣A1B1C1D1的各面的12条对角线中，与正方体的对角线A1C垂直的共有____ 条．
