In order to cut down on the carbon emission，more people choose to travel______.

A．by electric car，bicycle or plane

B．by private car，bicycle or bus

C．by bus，electric car or plane

D．by bicycle. bus or electric car

[单选题]Unable to break down the opposition,the president had to resign to bring or

[单选题]Carbon is an element， while carbon dioxide is a( )A.materialB.substanceC.or

[单选题]Carbon is( )， while carbon dioxide is a compound.A.a materialB.a substanceC

[单选题]One of the disadvantages of using carbon dioxide to extinguish a fire in an enclosed space isA．the 'snow' which is sometimes discharged along with the gas is toxicB．prolonged exposure to high concentrations of CO2 gas causes suffocationC．rapid diss

[单选题]The carbon deposits on the piston crown and in the ring grooves （）.A . should be scrapedB . should be derustedC . should be drilled outD . to be brushed off

[单选题]Portable carbon dioxide fire extinguishers should be sent ashore to be rechargedA．when the remaining charge volume is less than 90 percent of the required volumeB．at each inspection for certificationC．at each annual inspectionD．when the weight loss e

[单选题]As compared to carbon dioxide，dry chemical has which advantage?（）A . CleanerB . Effective on metal firesC . Greater rangeD . More cooling effect

[名词解释] 异头碳（anomeric carbon）

[填空题] 英译中（Translate）：carbon reaction（）

[单选题]（ ） are those made out to consignees with the words“to the order of ×××”or