[单选题]《安全生产法》规定,企业不得因从业人员对本单位安全生产工作提出批评、检举、控告或者()而降低其工资、福利等待遇或者解除与其订立的劳动合同。
A.紧急情况下停止作业、拒绝违章指挥
B.拒绝违章指挥、强令冒险作业
C.强令冒险作业、紧急情况下的撤离

Concrete is probably used more widely than any other substance except water, yet it remains largely unappreciated. “Some people view the 20th century as the atomic age, the space age, the computer age — but an argument can be made that it was the concrete age,” says cement specialist Hendrik Van Oss. “It’s a miracle material.” Indeed, more than a ton of concrete is produced each year for every man, woman and child on Earth. Yet concrete is generally ignored outside the engineering world, a victim of its own ubiquity and the industry’s conservative pace of development. Now, thanks to environmental pressures and entrepreneurial innovation, a new generation of concretes is emerging. This high-tech assortment of concrete confections promises to be stronger, lighter, and more environmentally friendly than ever before.
Concrete is also a climate-change villain. It is made by mixing water with an aggregate, such as sand or gravel, and ce
A. the traditional building material concrete is the only man-made miracle
B. concrete is indispensable in the development of modern construction industry
C. compared with other inventions, concrete is more practical and useful
D. concrete, as a building material, can be mixed with any other materials