[单项选择]If you leave a loaded weapon lying around, it is bound to go off sooner or later. Snow- covered northern Europe heard the gunshot loud and clear when Russia cut supplies to Ukraine this week as part of a row about money and power, the two eternal battlegrounds of global energy. From central Europe right across to France on the Atlantic seaboard, gas supplies fell by more than one-third. For years Europeans had been telling themselves that a cold-war enemy which had supplied them without fail could still be depended on now it was an ally (of sorts). Suddenly, nobody was quite so sure.
Fearing the threat to its reputation as a supplier, Russia rapidly restored the gas and settled its differences with Ukraine. But it was an uncomfortable glimpse of the dangers for a continent that imports roughly half its gas and that Gerard Mestrallet, boss of Suez, a French water and power company, expects to be importing 80% of its gas by 2030 much of it from Russia. It was scarcely more welcome f
A. vanish
B. linger
C. aggravate
D. rebound.

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