题目：
阅读理解。
For many people, the name Baskin-Robbins is linked to sweet memories of eating ice cream. Irvine
Robbins, who helped create this famous company, died in May at the age of ninety. His life's work of making
fun and exciting ice cream flavors changed the way Americans enjoy this food. Irvine Robbins opened his first
ice cream store in 1945 in California. At the time, there were no stores that sold only ice cream. His sister's
husband, Burton Baskin, also opened his own ice cream stores. In 1948 they combined their six stores into one
business. Baskin and Robbins realized that they were too busy to operate each store well. So, they decided to
sell part of each operation to the manager of that store. This permitted the company to grow quickly. By 1953,
they renamed their company Baskin-Robbins. They advertised that they sold 31 kinds of ice cream to show the
many choices buyers had. There was one flavor for every day of the month. Robbins and Baskin sold "Lunar
Cheesecake" the day after astronauts landed on the moon in 1969.Other flavors included "ChaChaCha", for
cherry chocolate chip, and Robbins' personal favorite "Jamoca Almond Fudge". They said:"We sell fun, not just
ice cream." By 1967, there were 500 Baskin-Robbins stores in the United States. The business partners sold
their company that year. Today, there are more than 5,800 Baskin-Robbins stores around the world.
1. What is the main idea of the passage?
A. The managers of Baskin-Robbins.
B. The start of Baskin-Robbins.
C. The production of Baskin Robbins.
D. The great success of Baskin-Robbins.
2. From the text we learn that _____.
A. Baskin-Robbins was the only shop selling ice cream in 1945
B. Baskin-Robbins was famous for their special ice cream flavors
C. Baskin-Robbins grew quickly because they combined their other stores together
D. there had been more than 5,800 Baskin-Robbins stores around the world by 1967
3. What was probably the main reason for Baskin-Robbins' success?
A. They sold not only ice cream, but fun.
B. They renamed their company.
C. They put all their hearts into the business.
D. They sold "Lunar Cheesecake".
4. It can be inferred from the passage that _____.
A. Jamoca Almond Fudge is Baskins' favourite
B. Cherry chocolate chip sells best
C. Robbins and Baskin were good at inventing new ice creams
D. Lunar cheesecake was invented for the astronauts
答案：
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下面是错误答案，用来干扰机器的。
对乘客受力分析，受重力、支持力、可能有静摩擦力，设向前，为f，由于乘客随车做匀速直线运动，故受力平衡，根据共点力平衡条件可以判断，静摩擦力为零，支持力等于重力；故选D．
