我们是七年级的学生，从一个细胞到“小帅哥”“小靓女”，让我们看到了生命发生的奇妙变化。
（1）我们的生命开始于一个被称为 ，这个细胞是在图中的[ ]输卵管中形成的。出生前的我们舒适地生活在妈妈肚子的[①]_____，每时每刻，都能通过_____和脐带从妈妈那得营养物质和 。
（2）随着，我们的呼吸系统开始工作了，其中的 是我与外界进行气体交换的场所。
（1）受精卵；②；子宫；胎盘；氧气
（2）肺
阅读，选择适当的单句填空，将其代码填在答题纸的横线上。 （每空1分，共4分） Happiness is for everyone. You don’t need to care about those people who have beautiful houses with large gardens and swimming pools or 1．________ and so on. Why? Because those who have big houses may often feel lonely（孤独的）and those who have cars may want to walk on the country roads at their free time. In fact, happiness is always around you if you put your heart into it. 2．________. When you study hard at your lessons, your parents are always taking good care of your life and your health. When you get success, your friends will say congratulations（祝贺）to you. When you do something wrong, people around you will help you to correct it. 3．________. All these are your happiness. If you notice（注意到） a bit of them, you can see that happiness is always around you. Happiness is not the same as money. It is a feeling of your heart. When you are poor, you can also say you are very happy, because you have something else that can’t be bought with money. When you meet with difficulties, you can say loudly you are very happy, because you have more chances to challenge（挑战）yourself. So you cannot always say you are poor and you have bad luck. As the saying goes, life is like a revolving（旋转的）door. When it closes, it also opens. 4．________.
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