题目

完形填空先通读短文，掌握其大意，然后从A、B、C、D四个选项中选出一个可以填入相应空白处的最佳答案，并将其标号填入题前括号内。A man feared his wife wasn't hearing as well as she used to and he thought she might need some hearing aid (助听). Not quite sure how to____her, he called the family doctor to discuss the problem. The doctor told him there was a simple test the husband could do to give the doctor a better____of her hearing loss.Here's what you do, said the doctor. Stand about 40 feet away from her, and in a____conversational speak已知i为虚单位，则复数的虚部为    ．