60. The first paragraph serves as a（n） (A) explanation (B) introduction (C) comment (D) background

66. Which of the following is TRUE according to the ad ? (A) The tourists will have to pay extra for fuel and meals. (B) The tourists will visit the 1920’s Shikumen buildings in Beijing (C) The tourists will take a side trip to the Three Gorges Dam during the tour. (D) The tourists will stay in Beijing for three nights before leaving for the UK