34×4=3(分米),
答:它的周长是3分米;
故答案为:3.
—Would you like to go to the cinema with me tonight?
—I'd love to, ______ I'm sorry I can't. I have to stay at home. [ ]
A. or
B. and
C. so
D. but
在调节静止的情况下,平行光线入眼后()称为散光。
A、不能形成焦点
B、焦点在视网膜前
C、焦点在视网膜后
D、焦点在视网膜上