八年级下册精彩练习答案

八年级下册精彩练习答案

I. 1-5 ABBCC 6-10 ABBAB
II. 1. Are, going to 2. What is,do 3. Why does, like 4. How does , play
III. 1. famous soccer star 2.arrives at / gets to 3. going to be 4. make usstronger
5. half an hour doing
IV. 1-5 CCACB 6-10 CBACB
V. One possible version:
My favorite sport issoccer. I think it is very popular all over the world. It can also make me strong.I play soccer with my friends every Tuesday and Friday afternoon. It helps tokeep us healthy. David Beckham is my favorite player. I am going to be afootball player like him when I grow up

嘻嘻，这道我们做过了。 你没写清楚（药物释放完毕后，y与t的函数关系为y=a/t，a为常数，还有一个图像，对吧） 1.反比例为y=a/t,把（3,1/2）带入 1/2=a/3 ∴a=3/2 ∴y=3/2t 设正比例为y=kx把（3/2,1）带入 1=(3/2)k ∴k=3/2 ∴y=(2/3)t (0≤t≤3/2） 2.释放过程为反比例 把y=0.25带入y=3/2t t=6 答：至少要6小时以后。