A:②为蛹期,③为幼虫期
B:为提高蚕丝产量,应延长②时期
C:菜粉蝶的发育过程是①→②→④
D:蝗虫的发育过程是①→②→③→④
—I was in the library. I____(search) for some information on the Internet.
_________ us with the ability to fight against disease, but it also helps us build our body. So, it is on my list of __________.
把肯定句改成否定句。
①今天他可能会来。
②你应该知道这件事。