单选题 In recent years , an increasing number of studies have suggested that there is a strong link between certain types of _______sweetener （甜味剂）and cancer. 

单选题 As he read the poem out loud , he mangled the ________ so badly that it scarcely made any sense and the audience left in the middle of his performance. 

单选题 The ceremony is held each year in March at the national cemetery where grizzled（头发斑白的）veterans in uniform gather at the war ________ and mourn for the deceased. 

单选题 She's made her point clear by mention that two people staring at distant points on earth would have totally differently ideas about where the ________  north pole lay.

单选题 The conference was _______ by a group of protesters who shouted and threw eggs at the speaker , which eventually led to chaos and violence on the spot. 

单选题 The Green Party has made aggressive attempts to call for a substantial ________ in the emission of greenhouses gases by the UK in order to create a better environment. 

单选题 William Walters lately has attempted to soften his image , holding a series of _______ discussion with undecided voters in their private gardens. 

单选题 Some farm workers who live along the US-Mexican border ________ into the US each year in hope of finding  work at harvest time snd settling down if possible.