阅读短文，判断正误。
Dear Joe,
    How are you? My sister and I are having our holiday. Yesterday we went to the library. We got there by bus. We read storybooks and had lunch there. The food was delicious. It was cheap, too. We went shopping in the afternoon. I bought a pair of shoes. I was very tired. We are planning to learn skating and do many other things during the holiday. We are sure we'll have a good time.
    How about your holiday? Please write to me soon.
Miss you.
Alice

某同学在显微镜下观察洋葱表皮细胞，经正确操作看清细胞后，他兴奋地把显微镜搬动给同桌同学看，结果视野变得很暗．要重新看清物像，先进行的操作应是（    ）

Some damage has been caused u____ by people simply walking around the site and some has been caused deliberately.

给下面加下划线的字选择正确的读音。

白桦____（huà  huá）    遗迹____（jì  jí）

淙淙____（cónɡ  zōnɡ）    旅行____（lǔ  lǚ）

扩句。

①他们经过黄河。

②他要写一首诗。