第二句中that people inherited from their parents 是用来修饰the physical traits的.are是谓语,前面一定要是个名词作主语.因为四个答案都是介词.with ,in ,for后面加上名词都不能作主语使用.所以只能选择Camong,表示在.中,.之一的意思.这句中表示的其中; 包括在内的意思.另一个例子:Among those present were...
As you may remember from biology class,genesare pieces of our DNA that control a specific characteristic (such as hair or eye color, etc.). Each gene is made up of two alleles, or specific forms of that gene. In short, genes and their alleles determine what traits we ...