In this research at Columbia University, Charles Townes worked with ______. A: stimulated emission B: microwaves C: maser D: stimulated emission and microwaves

Why are the sales of microwaves expected to rise?

What does Professor David Reay think of the use of microwaves?

What is the finding of the new study？ A: Quick-cooking microwave ovens have become more popular. B: The frequent use of microwaves may do harm to our health. C: CO₂ emissions constitute a major threat to the environment. D: The use of microwaves emits more CO₂ than people think.

In his research at Columbia University Charles Townes worked with all of the following EXCEPT______. A: stimulated B: amplification C: microwaves D: a maser

In his research at Columbia University, Charles Townes worked with all of the following EXCEPT _________. A: stimulated emission B: microwaves C: light amplification D: a maser

What is the finding of the new study? A: Quick-cooking microwave ovens have become more popular. B: The frequent use of microwaves may do harm to our health. C: CO2 emissions constitute a major threat to the environment. D: The use of microwaves emits more CO2 than people think.<br/>D选项的排放二氧化碳和原文可以匹配。

（2019.12-3.2）51.Popping food into the microwave for a couple of minutes may seem utterly harmless, but Europe’s stock of these quick-cooking ovens emit as much carbon as nearly 7 million cars, a new study has found.51. What is the finding of the new study? A: A) Quick-cooking microwave ovens have become more popular. B: B) The frequent use of microwaves may do harm to our health. C: C) CO2 emissions constitute a major threat to the environment. D: D) The use of microwaves emits more CO2 than people think.

What is the finding of the new study？ 未知类型：{'label': 'questionDesc', 'content': '请根据材料选择正确答案。', 'isMemberControl': 0, 'type': 181} 未知类型：{'label': 'source', 'content': '2019年12月 四级 卷二 仔细阅读2', 'isMemberControl': 0, 'type': 181} A: Quick-cooking microwave ovens have become more popular. B: The frequent use of microwaves may do harm to our health. C: CO2 emissions constitute a major threat to the environment. D: The use of microwaves emits more CO2 than people think.

The sales of microwaves are expected to rise because they have a shorter life cycle than other appliances. 未知类型：{'label': 'questionDesc', 'content': '请根据所给材料判断题干是否正确。', 'isMemberControl': 0, 'type': 181} 未知类型：{'label': 'source', 'content': '2019年12月 四级 卷二 仔细阅读2', 'isMemberControl': 0, 'type': 181}