【单选题】听力原文:W: How do you pay for your purchases with a credit card? M: Usually I sign a sales slip in the presence of the seller, and the signature is then compared to the signature on the card. Q: Where sh...
【简答题】阅读理解。 In the United States,train transportation is unpopular compared with cars and airplanes. Most people like traveling by car or by air. Officials of the United States Department of Transportation ...