园蛛捕猎靠的不是围追堵截，而是它黏性的网。

绿色植物是生态系统的（　　）

用如图所示的实验研究平面镜成像的特点时，至少需要____ 支蜡烛，每次实验中应观察比较____ ，并且量出____ .实验中用玻璃板替换平面镜是____ 法，选用茶色玻璃板而不是无色玻璃板的原因是____ .如果无论怎样移动蜡烛都无法与像重合，则原因可能是____ .

    Jenny is Mr. White's little daughter. She is good at Art . But she isn't good at Math. Mr. White is teaching her ,”What's six plus three?”

    Jenny counts her fingers and answers ,”It's nine .”

    “Good .What's twenty minus three?”

    Anna counts her fingers and toes. “Mm.it's five .No , it's seventeen .”Jenny answers slowly.

    “What's eleven plus twelve, then ?”Jenny looks at her fingers and toes . They are not enough (足够). Seeing this , Mr. White isn't glad and says, “Use your head, Jenny .”

    “That's not enough .I've got only one head.”

根据短文内容，判断下列句子是否正确。