阅读下列短文，根据短文内容，从短文后各题所给的A、B、C、 D四个选项中，选择最佳选项。

    Mom and dad are the most important people in your life. They have been looking after you since you were born, so you should always love them. You should also get on well with them. But some children don't know how to do this. Here are some ways to help you.

    Spend more time with your parents. Don't spend too much time playing computer games or watching TV. Ask your parents to play with you. Talk or go outside with them.

    Be kind to your parents. You can make them happy with a smile when you come home. You can send your mother a card on Mothers' Day or tell your father a joke on his birthday. You can also clean your room by yourself.

    Work hard.If you do your best in your studies, your parents will be proud of you.

中国不仅人口众多，而且分布很不____ 。黑河一腾冲一线以东，人口数量约占全国总人口数的____ ，而面积只占全国总面积的____ ，人口____ 。黑河一腾冲一线以西，人口数量只占全国总人口数的____ ，而面积却占全国总面积的____ ，人口____ 。