A:8−43π
B:8−23π
C:24﹣π
D:24+π
环节动物与节肢动物的相似之处是( )
伽利略的理想实验证明了( )
阅读短文, 判断句子对错。
I am 8 years old. I have 2 pencils. I have 4 rulers. I have a friend. Amy is 9 years old. She has 9 pencils and a ruler.
I'm eight years old.____
I have 2 friends.____
I have five rulers.____
Amy has nine pencils.____
Amy is nine. ____