D. It's not easy for others to notice a patient wearing the hearing aid.

答案　D　[细节理解题。根据第三段中的"called MDHearingAid AIR for its virtually invisible，lightweight appearance"可知，该款助听器是隐形的，即别人不容易注意到病人戴这种助听器。故选D项。]

Britain's housing crisis has reached a new peak with the average Londoner now needing a massive 14 times their annual salary to afford to buy in the capital. The research shows the crisis isn't limited to London either-many other cities，including Cambridge and Oxford，also have double-digit price to earnings ratios. Across the UK as a whole，people now need on average six-and-a-half times their annual salary to buy their own home.

As a result of being unable to afford to buy in the southern cities，families are being forced to move out to areas where house prices are lower. But this is putting increasing pressure on prices in cities such as Manchester and Birmingham where house price inflation is set to rocket. "Regional cities have more attractive affordability levels and house prices have a significant potential upside for growth in the near term subject to (受......支配) the outlook for the economy，" Richard Donnell from Hometrack said.

In a bid to ease the increasing pressure in the Britain's housing market，earlier this week Chancellor of the Exchequer Philip Hammond released a new Housing Infrastructure Fund which the government hopes will support the construction of 100，000 new homes in areas which "need them most". But Donnell said: "These measures focus on the longer term challenges of addressing housing supply and will have limited impact on the current situation of housing affordability，which will be decided by market forces and households' expectations for jobs and the cost of borrowing. "

While mortgage (抵押贷款) rates are at their lowest ever level，making it cheap to borrow，it seems fewer people are being approved for a loan. Yesterday the British Bankers' Association published figures showing that mortgage approvals were 10 per cent down in October from a year earlier. Fewer approvals and the continuing squeeze