【单选题】The waiter's face, tanned to a dark brown and deeply wrinkled, reminded Suchen of a walnut shell, yet his eyes, even in the dim light, ____ with alertness, like the eyes of a mountain lion.
【单选题】The waiter' face, tanned to a dark brown and deeply wrinkled, reminded Suchen of a walnut shell, yet his eyes, even in the dim light, with alertness, like the eyes of a mountain lion.
【单选题】Assume that in guinea pigs (豚鼠) , dark brown fur (B) is dominant to black fur (b). If you mate a homozygous black guinea pig with a heterozygous brown guinea pig, what proportion of the progeny will b...