Implementing the strategy of "going out" is an important measure in the new stage of China's opening to the outside world. The following belong to "going out" is () ① Gree Electric invested in Brazil.

Analysis of test questions: "going out" strategy is an important measure in the new stage of China's opening up. "Going global" refers to developing economic and technological cooperation with other countries through various forms such as investing and setting up factories abroad, contracting projects and exporting labor services. It can be seen that 123 is a specific measure of "going out", which meets the meaning of the question and can be chosen; Item 4, "leopard hotel & catering group transfers its equity to Europe's Anbaishen investment group", is a concrete measure of "bringing in" and has nothing to do with it, so it cannot be chosen. So, the answer is D.