听力原文:W: I want this sweater. And I think I'll take that pair of socks, too. M: All right. The sweater is $12.50. So the total is $16. Q: How much does that pair of socks cost? (14)
【简答题】There’s a body of water in Israel that is actually below sea level. Water constantly runs into it, but, because of the law of gravity (万有引力定律),nothing can flow out of it. Do you know the name of this ...