题目

如图，在4×4的方格纸中，每个小正方形的边长都为1，△ABC的三个顶点都在格点上，已知AC=2，BC=，画出△ABC，并判断△ABC是不是直角三角形． 答案： 解：如图，△ABC即为所求． ∵AC=2，BC=， ∴AC2+BC2=20+5=25， ∵AB2=42+32=25， ∴AC2+BC2=AB2， ∴△ABC是直角三角形．In August, 2012, I visited London with my husband(丈夫) and our two sons Sam and Eric. We spent four days visiting some interesting places and enjoyed ourselves. The fifth day, I wanted to relax at the hotel. But the children didn't like it. So I carefully thought about how we would spend the last day. I read a passage about HMS Belfast in a magazine. In fact, I was not very interested in visiting a warship(战舰), but my sons and their dad liked it. So we decided to go there.The weather was sunny that day. We left our hotel at 8：00 a.m. It took us about two hours to get to HMS Belfast. Children under 16 were free of charge(免费)．The price of the ticket for an adult (成年人) was ￡14.The warship was very large. We took some photos there. Sam was interested in everything on it and said it was the most interesting place in London.根据短文内容，回答下列问题。1.How many people did the writer visit London with?_______________________________________________________________________________2.What did the writer want to do on the last day?_______________________________________________________________________________3.Did the writer know about HMS Belfast from the Internet?_______________________________________________________________________________4.When did they get to HMS Belfast?_______________________________________________________________________________5.Who was interested in everything on the warship?_______________________________________________________________________________