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1. The political future of the president is now hanging by a __. A thread B cord C string D rope 2. The question is still__ discussion. A in B by C for D under 3. We managed to reach the top of the mountain, and half an hour later we began to __. A ascend B descend C decline D plunge 4. To survive in the intense trade competition between countries, we must__ the qualities and varieties of products we make to the world-market demand. A improve B enhance C guarantee D gear 5. There has been a __ lack of communication between the union and the management. A regretful B regrettable C regretting D regretted 答案： 1-5ADBDB 1.选A 四个选项都有绳索这个意思，但只有thread和hang by构成习语：hang by a thread千钧一发，危在旦夕 2.选D be+ prep+n(表动作的名词)来表示被动而under discussion是习惯搭配 | 
