下图是黏虫发育过程的四种虫态图，填写四种虫态的名称，并回答以_爱下问搜题

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问题读图填空题

下图是黏虫发育过程的四种虫态图，填写四种虫态的名称，并回答以下问题。

（1）用序号表示黏虫的发育顺序________→_________→_________→_________。

（2）黏虫发育属于______________。

（3）为防止黏虫的危害，消灭黏虫的最佳时期应放在_________期。

答案

①成虫 ②幼虫 ③卵 ④蛹

（1）③②④①

（2）完全变态发育

（3）幼虫

完形填空

IMAGINE a life without arms or legs! You can’t hold anyone in your   1 . You can’t walk anywhere with your feet. How would you last a day like that? Would you   2  at yourself in the mirror like Nick Vujicic, the 29-year-old Australian?
Nick was born without limbs（四肢）, so life was not   3  for him. At school many students played jokes on him   4  he looked different from everyone else. He was refused to be   5  friends, so he always felt   6 . However, he faced that bravely. He   7  to type and write with two toes（脚趾）at the age of six, and he could   8  surf and play golf. In college, he achieved great success and was among the   9  students in the studies. And he decided on   10  to do later in his life—to encourage others to work hard for their dreams.
Now Nick is one of the most popular   11  in the world. He travels to many countries and gives speeches about his story   12  difficulties. “Living life fully is about looking at what you   13 , not what you don’t have.” he said. His   14  encourages millions of people.
“I tell people to keep on getting up when they   15  and to always love themselves,” he said. “If I can encourage just one person, then my job in this life is done.”

选择题

共线的充要条件是（　　）

两向量中至少有一个为零向量

C．∃λ∈R，

D．存在不全为零的实数λ₁，λ₂，λ1