【单选题】Scientists generally agree that the Earth's climate will warm up over the next 50 to 100 years ______ it has warmed in the 20000 years since the Ice Age.
【单选题】Scientists generally agree that the earth's climate will warm up over the next 50 to 100 years ______ it has warmed in the 20000 years since the Ice Age.
【单选题】Scientists generally agree that the Earth's climate will warm up over the next 50 to 100 years ______it has warmed in the 20,000 years since the Ice Age.