锯削时应根据被锯材料的软硬、厚薄来选择锯条锯齿的粗细。
参考答案:对
用所给词的适当形式填空。
Hello! Boys and girls. I'm David. I'm a reporter from School Life Radio Station. Thank you for
1_____ (listen) to me. I'm in Australia now. It's sunny today. It's a very beautiful place 2_____ (have)
fun. There 3_____ (be) lots of people here on vacation. Some 4_____ (lie) on the beach. Others
5_____ (swim) in the sea. The water is clean and blue. Look at the group of boys 6_____ (play)
beach volleyball. They 7_____ (look) cool. A girl 8_____ (sit) under the sun umbrella and drawing
pictures. Everyone 9_____ (have) a good time! What are you doing now? I hope you can
10_____ (have) a good time, too.
________ mud on his trousers brushes off easily.
A.Drying
B.Having dried
C.Being dry
D.Dried