问题详情

According to the passage, which of the following statements is true？

A．All kinds of the unconventional gas are being much developed in Australia.

B．Most of America"s natural gas now comes from the conventional sources.

C．The development of the unconventional gas results in higher gas prices.

D．Only in the US has the unconventional gas been developed to any extent.

请帮忙给出正确答案和分析，谢谢！