下列各句中，没有语病的一项是（  ）

对于个人和社会的关系，正确的理解是（  ）
①个人是社会的成员，个人离不开社会
②社会由个人组成，社会也同样离不开个人
③个人活动对社会发展没有影响
④社会为个人的成长、发展提供必要的条件和良好的环境 

根据短文内容，用方框中所给单词的适当形式填空，每词限用一次。                                                                                     

    Do you love animals? Would you like to keep animals as a pet? Nowadays, many people like to keep pets at home. The most popular____  are cats and dogs. They are friendly to people, and they are also ____  to take care of. Some people like parrots as pets. Pets lovers will____ lots of things for their pets, such as beds, clothes and even toothbrushes. Pets are very useful, too. The people who can’t hear need the dogs' help to answer the door. And the people who live____  should keep a pet if he wants to be healthier and ____ . If you have pets, don't forget to spend more time with them. They need love, too.

某大学为调查来自南方和北方的同龄大学生的身高差异，从2011级的年龄在18～19岁之间的大学生中随机抽取了来自南方和北方的大学生各10名，测量他们的身高，量出的身高如下：（单位：cm）

（Ⅰ）根据抽测结果，画出茎叶图，并根据你画的茎叶图，对来自南方和北方的大学生的身高作比较，写出两个统计结论；

（Ⅱ）若将样本频率视为总体的概率，现从来自南方的身高不低于170的大学生中随机抽取3名同学，求其中恰有两名同学的身高低于175的概率．