我国很早就有人掌握了养蚕、编织丝绸等技术。其中有一道工序是将蚕茧用热水浸泡后缫丝，此时茧内的家蚕发育到哪一阶段                   （ ） 

阅读短文，判断正误。

    Lily and Mary are good friends. They come to the park on Sunday morning.

    The park is beautiful. There are many flowers. Lily is very happy. She wants to take some flowers home. But Mary says, “We can't pick flowers.” “It don't matter.” Lily says. So she picks many flowers.

    Lily wants to show them to Mary. But Mary is not there. A moment later, Mary comes back with a man .Lily is fined(罚款）$10 for picking the flowers. The man says, “Everyone should obey the rules and protect the flowers and grass. They are our friends.”Lily is very sorry now.