题目内容：
根据以下材料，回答题Everydream is a message from your unconscious self, expressed in a code which onlyyou can understand and interpret. The images, colors, moods, and terms of yourdreams depend on your culture, upbringing, slang and your own understanding ofthings and values. Dreaming is like looking into a mirror and seeing yourselfwith your own eyes.
The firstdreams which we have after falling asleep often revolve around the day'sevents. We go through them, sorting out and discarding things we don't need toremember and gaining insight into those we do. Often, we are inspired withsuggestions that we can use to remedy the situations that plague us by day. Aswe progress through the night's dreams, they may take up more fantastic qualities,offering fanciful experiences. These often pleasant images can relieve thestress of the day. But the dream we have just before the awakening oftencontains information the subconscious mind wants to make known to theconscious. And this information, if remembered, interpreted, and understood,can serve as an important tool in our lives.
Dependingupon the content, dreams can strike us with their peculiarity, or sometimeseven their alarming nature. Some dreams haunt us for years, not only because oftheir persistence, but also primarily because we cannot explain or understandthem. Other dreams stand out with weird mixture of images, emotions andcontext, which make us remember them for life. Recurring dreams are quitecommon, and we are facing the same problem over and over again. A recurringdream is often a sign of some emotional weakness in our nature, which causes usproblems over the years.
Luciddreams are rare, but they are all about people's ability to control theirdreams. In such a dream, the dreamer becomes consciously aware that he/she isdreaming and is able to use the memory and participate in dream actions and emotions.Lucid dreams are usually enhanced in a sensory and imaginary way, and sometimescan be accompanied by pleasant music. People can learn the techniques ofcontrolling their dreams. Some historic manuscripts and records say that theability to control dreams helps a person to reach a higher degree of minddevelopment. This is what some Tibetan Buddhists and Islam followers practicedfor the purpose of elevation in consciousness.
Dreams can only be understood by the dreamer because_______. A． theyare always based on your deep feelings
A．they are always based on your deep feelings
B． theyare expressed in a code only you can understand
B． they are expressed in a code only you can understand
C． theyare always something related to your upbringing
C． they are always something related to your upbringing
D． theyare related to your personal culture
D． they are related to your personal culture
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