题目

You sometimes feel so close to your friends that they are like family to you. Why? A study by San Diego, a professor, has found you and your friends have more genes (基因) in common than strangers do. Maybe this gives you the answer. Researchers looked at the genes of 1,932 people and compared them in pairs of friends and strangers. They found that friends have 1 percent of genes that match. “One percent may not sound like much to laypersons (外行),but to geneticists (遗传学家) it is a huge number,” Professor Nicholas said. “In fact, this is the same amount of genes you share wit如果1.5x+3=9，那么2x-0.7=（    ）A.4.5B.5.4C.6.4D.7.3