炸药在井下30m处爆炸,井口检波器记录的井口时间为20ms,波传到地震面的速度是()。
A.150m/s
B.1500m/s
C.300m/s
D.3000m/s
参考答案:B
根据短文,圈出正确的单词。
Damings Diary
Wednesday, Rainy
Today I got two letters in English. One is from Lingling in England and one is from my cousin in America.
Lingling l.(went/goes) to a children's theatre last week. The Show 2.(was/is) very funny. She 3.(laughed/is
laughing) a lot. They 4. (eat/ate) hamburgers and chips then My uncle 5.(read/is reading) a book about
Chinese history. He 6.(ask/is going to ask) me some questions. I 7.(brought/am going to Bring) some CDs
of Chinese songs for them tomorrow.
人际交往是人所特有的一种()
A.生理需要
B.精神需要
C.物质需要
D.以上都不是