题目

To support his sick wife and earn a paycheck, a 61-year-old Iowa man named Steve Simoff sometimes walks 35 miles to his job as an overnight gatekeeper. Simof said that he leaves his basement apartment in a small town at about 3:30 p.m. to get to the Lakesside hotel and Casino in Osceola where he begins to work at 11:00 p.m. for $9.07 per hour. His wife suffered a stoke nine years ago and some days there just isn’t enough money to put gas in the couple’s 2002 car. Moving closer to his job would likely mean paying more than he now does in monthly rent---$400. Family and a job are “甲型H1N1流感病毒变异后的直径为0.00000013米，将这个数写成科学记数法是（ ）A．1.3×10-5B．0.13×10-6C．1.3×10-7D．13×10-8