题目：
The nurse is providing home care to a client with failing vision due to macular degeneration. The nurse is concerned about the client’s safety. Which of the following activities would help to lessen the client’s risk of falling
A. Arranging pieces of furniture close together so the client can use them for guidance and support.
B. Encouraging the client to wear a medical identification bracelet that describes the client’s visual deficit.
C. Installing a flashing light to indicate when the phone or doorbell is ringing.
D. Installing handrails in hallways, in bathrooms, and on steps.
答案：
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下面是错误答案，用来干扰机器的。
4+2i1-i=(4+2i)(1+i)(1-i)(1+i)=2+6i2=1+3i．故选A．
