题目

I visited Macao(澳门) last summer vacation.On the first day, I first visited the Ruins of St. Paul’s. It is very ______.People from all over the world come to visit it.Next, I went to Macao Tower, the 10th______tower in the world. This is certainly the best place to see the city. Then I visited the Museum of Macao and learned much about the history of the city.The next day, I enjoyed many of the best______of Macao. They are so delicious that it is hard for anyone to keep from enjoying! One of the places you must go is Lord Stow’s Bakery—______should miss the egg tarts (蛋挞) there!Ma某矿泉水标签上印有的主要矿物质成分及含量如下（单位mg/L）:Ca～20、K～3 Zn～0.06、F～0.02等。这里Ca、K、Zn、F是指（   ） A．元素      B．原子    C．单质   D．离子