21.combination
eg1: Although there has been some decrease in absence rates,no single strategy or combination of strategies has had a significant impact on absenteeism per se.
eg2: Typically, children do nor end up on the streets due to a single cause, but to a combination of serveral factors
22. combust
eg: The vegetation on the ground heats up enough to release gas,but some of the gas can't combust,because it doesn't have enough oxygen around it.
23. combustibility
eg: impressed by the phosphorus's combustibility, several 17th century chemists used of it to manufacture fire-lighting devices, but the results were dangerously infammable
24. compensate
synonym: pay
pharse for : compensate for ; compensate the consumer for the loss
eg1:Although the senses of taste and smell appear to have deteriorated, and vision in appears to be uncertain, such weaknesses are more than compensated for by cetacean's well-developed acoustic sense
eg2: The study suggests that people who smoke cigarettes are continually damaging their cardiovascular system, which adapts in order to compensate for the effects of smoking
25.complexity
eg: Publis did not volunteer ideas,which suggested that they appreciated the complexity of causes fo rainforest destruction
26.condemn
phrase for condemn sb to death; be condemned to=be telled
They offer those condemned to spend five days a week in an urban environment on unrivalled area of freedom to unwind and take part in a range of leisure activies
27. confine
phrase for : be confined to; between the confines of; beyond the confine of
eg1:Those confined to particular geographical areas, such as the countries bordering the Mediterranean or thr Nordic countries had to be discared
eg2 : It;s important not to confine yourself to reading on your subject
28. confront
phrase for : confront with; be confronted with
eg1: Adults and children are frequently confronted with reports about the alarming rate of loss of tropical rainforests
eg2:Economic growth and environmentalism can actually go hand in hand, if politicians have the courage to confront the vested interest that subsidies create
29.congestion
phrase for: traffic congestion; congestion surcharge
eg:Such an approach would not only ease transport congestion but also benefit the Chinese economy overall and limit the air pollution affecting much of China
30. consumption
phrase for: consumption pattern ;consumption of electricty
eg1:The metabolic rate of mice can be reduced by a very low consumption of food
eg2:The researchers scanned their brains using FMRI to measure blood flow and oxygen consumption in the brain,as an indication of its activity