41. B
依据：He wanted to buy a nice looking watch.
42. B
依据：Just then a young man came in, took the watch out of the owner’s hand and ran out with it.
When the owner ran out into the street, the young man was already gone.
43. C
依据：店里卖500 dollars，而年轻人只卖100 dollars.
44. D
这个年轻人是店主的同伙，即中国的“托”，串通欺骗这个美国人。
45. C
B B C D C
我在美国待四年了，不会错的
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