(Reuters) - European shares fell on Thursday as investors braced for the latest batch of business activity data to underline the blow to the euro zone economy from sweeping lockdown measures imposed to curb the virus spread.The pan-European STOXX 600 fell 0.9% by 0708 GMT, retreating from its strongest close in three weeks.Stock markets globally have made headway this week as several countries emerged from lockdowns and talks of more stimulus for the battered euro zone economy revived hopes of..