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．選A 四個選項都有“繩索”這個意思，但只有thread和hang by構成習語：hang by a thread千鈞一發，危在旦夕

2．選D be+ prep+n（表動作的名詞）來表示“被動”而under discussion是習慣搭配

3．選B descend 指人，物體從某一高度/斜面上“下來/降”On turning the corner, we saw that the road descended sharply.

decline 強調權利，繁榮，成就，健康狀況，體力，記憶，數量的“減少，衰落”His influence declined after he lost the election.

ascend漸漸上升，descend的反義詞。We watched the balloon ascend higher and higher.

plunge使突然前傾或下降The sudden application of the brakes plunged him forward.

enhance 增加，提高The moonlight enhanced the beauty of the scene.

4．選D gear to使……適合，配合We must gear the amount of products we make to the increase in public demand. 現在來分析題目.題中的To……,是目的狀語.而we 是主語, gear.to是謂語,而the qualitiesand varieties of products 是賓語,而we make 是來修飾這個賓語的,the world-market demand是賓補.句子的大致意思就是說我們必須根據市場的需求制造商品,才能在市場上立足.

5 選B regrettable 可惜的regretful后悔的，抱歉的