答案　B　[考查情态动词。在情态动词表推测时，must只用于肯定句中；而

can 用于否定句或疑问句中。A、C、D中均有不正确项mustn't。故只有B项正确。答句句意：他一定是在开玩笑，他不可能在说实话。]

10．Over two thirds of the population were believed to have no________to the health care in the west rural areas in China.

　　A．aid B．basis

　　C．belief D．access

答案 D [句意：人们认为，中国西部农村地区三分之二以上的人口享受不到医疗保健。have access to"得以使用"，符合句意。aid帮助；basis基础；belief信念。]

11．This kind of medicine，________by American chemist Professor Carl in 1951，

saved millions of people's lives.

A．being invented B．to be invented

C．inventing D．invented

答案　D　[句意：这种药1951年由美国化学家卡尔教授发明，挽救了数百万人的生命。medicine和invent之间存在逻辑上的被动关系，应该选择过去分词作定语，发明的动作是在1951年，意味着动作早已完成，所以选择invented，既表被动又有完成的含义。]

12．Even some of the casual garments we wear have brand names________them which turn us________walking advertisements.

　　A．attached to；into B．attaching to；to

　　C．appealed to；into D．contributed to；to

答案 A [attach to贴在......上；appeal to吸引；contribute to捐赠，有助于。根据句意可知，应该用attach to，且attach to和brand names之间是动宾关系，因此要用过去分词(这里的过分词短语attached to them作names的定语)。turn...into..."把......变成......"，是固定短语。]

13．-Cinderella has been learning Chinese in BeijingUniversity for the past four years.

-No wonder she ________above her colleagues in Chinese.

A．stands out B．sticks out

C．comes out D．sorts out

答案　A　[答语句意：难怪她的汉语比她的同事们学得好。stand out突出，杰出，符合句意。]