5. Because of their properties, noble gases have many important applications. They are widely used in recreation, medicine and industries. For instance, Liquid Helium is used for superconducting magnets(磁体). These magnets are very important in physics and medicine. When a doctor suspects that a persons brain has been damaged, he might request for Magnetic Resonance Imaging (MRI). MRI allows the doctor to see the brain, without operating on the patient.

　　23. Paragraph 2

　　【答案】：E

　　24. Paragraph 3

　　【答案】：C

　　25. Paragraph 4

　　【答案】：D

　　26. Paragraph 5

　　【答案】：A

　　A. What are the applications of noble gases?

　　B. How were noble gases discovered?

　　C. What are noble gases?

　　D. What cause the low chemical reactivity of noble gases?

　　E. How were noble gases understood in the past?

　　F. What is the periodic table?

　　27. Noble gases are not very chemically______.

　　【答案】：F

　　28. Among the elements of noble gases Helium is the____.

　　【答案】：C

　　29. The required number of electrons in noble gases` outer shell is _____.

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