酶加速化学反应速度是因为（）。

[问答题]Passage 4　　● Read the following information about the IMF.　　● Choose the best word to fill each gap. Mark one letter (A, B, or C) on your book.　　● Do not use any letter more than once.　　The IMF, (29)______ the World Bank, grew (30)______ of the l994 Bretton Woods conferences. It hoped to secure the advantages of the gold standard without its disadvantages. Exchange rates were in the beginning envisaged to be relatively stable. (31)______ there were to be orderly ways to unpeg parities that represented clear undervaluation or overvaluation. International cooperation (32)______ replace the previous automatic mechanism. Also, countries were to be spared the need to make adjustments by painfully deflating (33)______ into drastic unemployment. And the IMF still hopes to lessen the need for import controls. How do IMF operations work? Here’s one case.　　Ordinarily, a country (34)______ for its imports by (35)______ of its exports or long-term borrowing. Suppose a country, say, the United Kingdom, is in need of short-term credit from the IMF. How exactly does the IMF enable such a debtor country to (36)______ hold of dollars? It does this by (37)______“purchasing rights”. It simply lets the British buy with British currency some of the Fund’s own holdings of dollars. (38)______ the British balance of payments has improved, Britain is expected to buy back with gold or dollars, (or, as we’11 see, with SDRs or “paper gold” 1 the pounds it has sold to the Fund.　　From l 945 until l 971 when the Bretton Woods system broke down forever。the IMF nurtured the illusion that it could keep exchange rates pegged most of the time.Only (39)______ the extreme pressure of fundamental disequilibria persisting in a country’s balance of payments (40)______ the IMF expect that country to depreciate its exchange rate.　　The IMF and its leading members put up a gallant but hopeless fight to make stable exchange rates work.　　29. A. As　　　　B like　　　　　C to　　30. A out　　　　B from　　　　　C into　　31. A. Also　　　B Moreover　　　C But　　32. A was to　　 B is to　　　　 C has to　　33. A itself　　 B themselves　　C ourselves　　34. A pay　　　　B paid　　　　　C pays　　35. A means　　　B mean　　　　　C meaning　　36. A keep　　　 B get　　　　　 C gets　　37. A extends　　B extend　　　　C extending　　38. A. After　　 B Before　　　　C Until　　39. A in　　　　 B under　　　　 C by　　40. A should　　 B could　　　　 C would

[单选题]（）指行政主体针对特定的相对人，就特定的具体事项，作出有关其权利义务的单方行为。

[单选题]解除喉痉挛的首选措施是（）

[问答题]试论德国《魏玛宪法》的主要内容。

[单选题]客运经营者因故不能发班的，应至少提前（）天告知客运站，双方要做好协调并调度车辆顶班。

[单选题]下列哪项不能减轻反流误吸的是（）

[单选题]以下不属于早期矫治的有利因素的是（　　）。

[填空题]各类履带式机械、重型机械及超重机械进厂，其路线必须按事先已批准的指定路线进场，否则对道路及地下设施造成破坏，由当事单位负责（）或（）。

[多选题]票据和结算凭证的（）不得更改，更改的票据无效。

[多选题]如图所示，是某电场中的一条直电场线，一电子仅受电场力的作用，从a点由静止释放，它将沿直线向b点运动，下列说法正确的有（　　）．