中国现在拥有全球最大的移动电话网，同时，中国也投资新型能源，确保持续增长并应对气候变化。

Sentence No. 1 Evidence shows that older people who participate in lifelong learning are healthier, more active and have more social contacts.

Sentence No. 4 China now has the world’s largest mobile phone network, and it is investing in the new forms of energy that can both sustain growth and combat climate change.