B. She never went back to Cincinnati after she came back to Germany.

　　C. She seldom hung out with her American friends as she was too busy.

　　D. She did miss her friends in Cincinnati when she was at the TU-Dresden.

　　55. What is the best title for this passage?

　　A. University life in Germany

　　B. My culture shock experience

　　C. Advantages of living in USA

　　D. How to be an au pair in USA

　　B

　　When you hear the word quicksand, what image comes to mind? You probably picture someone up to the waist in wet land, screaming for help. In fact, quicksand can be very dangerous. People and animals have sunk into quicksand before and never escaped. However, the more you know about quicksand, the safer you will be.

　　First, quicksand is really ordinary sand. It isn’t some sort of strange hungry beast. Quicksand forms when water seeps up (渗出) from the underneath a layer of fine sand. The water pushes the grains of sand apart and makes the sand loose. This loose sand will not hold up a heavy weight.

　　Quicksand usually forms along the banks of rivers, at the seashore, or under slow-moving rivers and streams. It only forms when water flows upward through the sand, not over it. If you are in a place that tends to have quicksand, it’s a good idea to carry a large stick. As you walk, poke (戳) the ground in front of you to be sure it’s firm.

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