What a nice picture!—Thanks. It’s a photo ________ my family.

asy is it to find a taxi in this city—Simply _______ your hand, and a taxi appears in notime

My father likes smoking. He often says that giving up smoking is the easiest thing in the word. I know because I________ it thousands of times.

4I’m poor at English, so to make a speech in English at the meeting is ________ my ability

填入下面一段文字横线处填入语句，最恰当的一句是（ ）种群中较弱个体的存在，可能有助于加强种群的长期稳定性，从而减少灭绝的险。 ，结果发现，鱼群中混有多种不同的性状，会对种群产生积极的影响。那些在近海珊瑚礁区发育的幼鱼更可能返回成年时的栖息地；那些在潮池区发育的幼鱼可能成为繁殖的“赢家”，但它们通过增加数量和减少波动，为种群的稳定性做出了贡献。