1) Graphene was one of the breakthrough science stories of the new millennium, _______ as a wonder material of the future. a) acclaimed  b) hailed c) regarded d) described 2) Before it was isolated, scientists had made _______ attempts to obtain a single sheet of carbon atoms. a) deliberate b) persistent c) painstaking d) determined 3) The material proved to be remarkably _______ — 200 times stronger than steel. a) tough b) firm c) solid d) robust 4) One of the first problems was how to produce it commercially, as it wasn’t practical to make the microscopic flakes at the _______ required. a) quantity b) scale c) extent d) degree 5) Graphene has opened up a whole new world of scientific exploration, _______ scientists to investigate its electrical properties. a) allowing b) encouraging c) prompting d) inspiring 6) Graphene is made from ordinary graphite — the material used to make _______. a) pens b) pencils c) markers d) chalk 7) Geim discovered graphene by examining a ball of scrunched-up _______ under a microscope. a) foil b) paper c) tape d) cloth 8) Graphene conducts electricity and heat _______ well, making it very promising for electronics. a) extremely b) incredibly c) reasonably d) unusually 9) One of graphene’s first commercial applications involved enhancing materials like rubber and _______. a) metal b) glass c) plastic d) ceramic 10) Because graphene is stable and non-reactive, it could have potential _______ uses. a) medical b) culinary c) decorative d) mechanical

Engineering_C1/C2

per en/la
Imprimir
Incrustar

Tauler de classificació

Estil visual

Opcions

Canvia de fonament

Restaurar desada automàtica: ?