题目

某地区的豹种群数量较少，而且出现较多疾病。为避免该种群消亡。由其它地区引入同种8只雌豹，经过十年，该地区豹种群增至百余只，在此期间该地区 A.豹后代的性别比例明显改变 B.豹种群遗传（基因）多样性增加 C.生存斗争激烈程度下降 D.豹种群的致病基因频率不变 答案：B单词拼写【1】The meeting had scarcely begun when it was ________(打断).【2】It was very ________(考虑周到的) of you not to play the piano while your mother had a bad headache.【3】The government is _________(呼吁）to people to protect the environment.【4】I am glad to hear that you have _________(克服）such difficulties.【5】We ________(原谅）his bad temper because we knew that his son’s illness had put him under great stress.【6】He was faced with the severe financial b________ of caring for his wife and five children.【7】The two men q________ bitterly and it was clear that the argument could only be settled by the police.【8】If you are in trouble, don’t h________ to ask me for help.【9】The company has to be shut down for l________ of money.【10】He has a________ himself quickly to the heat of the country.