单项选择题A．factB．aspectC．viewpointD．fashion

单项选择题A．stoppedB．preventedC．infectedD．cured

单项选择题A．seldomB．rarelyC．usuallyD．hardly

单项选择题A．themselvesB．himselfC．someoneD．oneself

单项选择题A．dozensB．dealC．quantityD．multitude

单项选择题A．completelyB．partiallyC．continuouslyD．uncomfortably

单项选择题A．shorteningB．lengtheningC．leasingD．living

单项选择题A．constructedB．basedC．foundD．depend

单项选择题A．whateverB．wheneverC．howeverD．wherever

单项选择题Many houses in the north are warm in winter because they are ______ so that the heat is not lost.