【正确答案】It gives me great pleasure to meet you again here in this beautiful city of Sydney. The topic we are addressing today, namely, "Strengthening Our Community, Building a Sustainable Future" is a highly important one.
The world economy is undergoing profound changes. Economic globalization is gaining momentum; rapid progress is being made in science and technology; all these offer US rare development opportunities.
On the other hand, problems such as growing imbalances in the world economy, mounting pressure on energy resources and the increasingly acute issue of climate change pose grave challenges to all countries and regions which are endeavoring to build a sustainable future.
How can we build a sustainable future in the face of both opportunities and challenges? This is an important issue that deserves our close consideration and earnest response.

【答案解析】[听力原文]
今天，有机会同大家在美丽的悉尼再次相聚，我感到十分高兴。我们要讨论的“加强大家庭建设，共创可持续未来”这个主题十分重要。
当前，世界经济正在深刻变化。经济全球化深入发展，科技进步日新月异，各国正面临着难得的发展机遇。
同时，世界经济失衡加剧，能源资源压力增大，气候变化突出，这些问题给各国各地区共创可持续未来带来严峻挑战。
在机遇和挑战并存的情况下，我们如何携手共创可持续未来，是必须认真思考并严肃回答的重大课题。