使用显微镜的方法步骤是____ 和 ____、____ 、____ ．

个别人出于恶作剧或为提高个人网上空间点击率等目的，编造各种谣言，并在互联网相关论坛里发帖，造成了不良影响，触犯了有关法律。公安机关对相关造谣人员分别处以治安处罚。这表明（    ）

①公民在网络上是没有言论自由的

②公民的自由总是在法律规范内的自由

③公民只有先履行义务，才能行使权利

④公民有使用网络的权利，也有维护网络文明的义务

Dear Sally,

    Thank you for your e-mail and the photo of New York. Here are some photos of my family trip in Wuhan. In the first photo, my sister Jane is wearing Chinese traditional clothes on the Yellow Grower. In the second picture, my father and I are swimming in a river. It's so cool! In the next picture, my parents, Jane and I are eating great noodles. Its name is hot dry noodles. It looks very nice!

    In the last picture, my family people are at my friend's home. We are having some mooncakes because it's the Mid-autumn Festival. It's an important festival in China. On this day, all the families get together and have a happy dinner.

    I think Wuhan is a nice city in China. The people there are friendly. One day I wish to go there again.

Yours,

David