小强在水中练习潜水,则能正确反映岸上教练看到水下小强的光路图是( )
A:
B:
C:
D:
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. ____
下列有关骨骼肌的叙述中,错误的是( )