题目

某温度下，体积一定的密闭容器中进行如下可逆反应：X(g)＋Y(g) Z(g)＋W(s) ΔH>0，下列叙述正确的是( )A. 加入少量W，逆反应速率增大B. 当容器中气体压强不变时，反应达到平衡C. 升高温度，平衡逆向移动D. 平衡后加入X，上述反应的ΔH增大 答案：【答案】B【解析】该反应是体积减小的、吸热的可逆反应。所以当压强不再变化时，反应即到达平衡状态。升高温度平衡向吸热反应的方向移动，即向正反应方向移动。W是固体，其质量多少，不能影响反应速率。反应热只有方程式中的化学计量数和物质的状态有关，所以该反应的反应热是不变的。答 　　填空 　　Two friends visited the zoo together．The zoo was very large and it was 　　1　　 to go everywhere．They had to decide where to go and which animals to visit as their time was 　　2　　 So both of them agreed not to 　　3　　 after choosing a 　　4　　 at every fork(岔路口)． 　　A road sign at the first fork 　　5　　 one way to the lion area and the other to the tiger hill．They decided on the former after a 　　6　　 discussion because lions were“the king of the grassland”．The second showed a division going separately to the panda and peacock．They 　　7　　 panda as it was the nation’s treasure and went its way． 　　　　8　　 they made choices all along the way and each choice meant 　　9　　 what they couldn’t help regretting．But they had to make it, and 　　10　　, for it brooked(容忍)no delay．If they hesitated(犹豫不决)they would miss 　　11　　．Only 　　12　　 decision could offer more chances for sightseeing and 　　13　　 possible regret． 　　Life is 　　14　　 like this-choices often occur that one has to make, for example, between two 　　15　　 jobs, two fascinating wooers(追求者)．To get one you 　　16　　 give up the other-you can get half of it．If you 　　17　　 weighing the pros and cons and calculating gains and losses, you will most likely 　　18　　 empty-handedness．Don’t be sad about it．　　19　　 you have got half of the desirable things in life-something that is 　　20　　 to come by． (1) [　　] A． easy B． difficult C． impossible D． possible (2) [　　] A． enough B． limited C． tight D． plentiful (3) [　　] A． return B． continue C． go D． stop (4) [　　] A． sign B． branch C． crossing D． highway (5) [　　] A． showed B． pointed C． intended D． made (6) [　　] A． brief B． long C． no D． heated (7) [　　] A． hoped B． wanted C． favored D． got (8) [　　] A． Happily B． Thus C． Then D． Finally (9) [　　] A． winning B． taking C． picking up D． giving up (10) [　　] A． slowly B． immediately C． timely D． easily (11) [　　] A． less B． more C． most D． least (12) [　　] A． high B． slow C． short D． rapid (13) [　　] A． increase B． cause C． reduce D． raise (14) [　　] A． just exactly B． more or less C． hardly D． most (15) [　　] A． unwanted B． different C． bad D． desirable (16) [　　] A． ought to B． may C． must D． have to (17) [　　] A． spend time B． kill time C． have a hard time D． hope for (18) [　　] A． start with B． get up C． succeed in D． end up in (19) [　　] A． By no means B． Not in the least C． At most D． At least (20) [　　] A． stupid B． delighted C． hard D． supported