当前，祖国内地和香港的发展都处在一个新的历史起点上。我们既面临着难得的发展机遇，也面临着严峻挑战。（ ）

A、We are now standing at a new historical juncture in the development of both the mainland and Hong Kong and are facing rare opportunities for development and severe challenges.
B、Both the mainland and Hong Kong are now at a new historical starting line in their development endeavor. We face both rare opportunities of development and grave challenges.