杀毒软件对于病毒来说永远是落后的，也就是说，只有当一种病毒出现后，才能产生针对这种病

山西省农村大力推广使用沼气。试用你所学的化学知识回答下列问题：

(1)沼气的主要成分是_____________(填化学式)。

(2)用家畜粪便、秸秆等作原料生产沼气的过程主要发生________(填“物理”或“化学”)变化。

(3)用沼气作燃料与直接用秸秆作燃料相比，前者的优点是_________

直肠指诊可触及条索状瘢痕物的可能是（）

A.直肠癌

B.肛裂

C.直肠息肉

D.肛瘘

E.内痔

第二节：完型填空（共20小题；每小题1.5分，满分30分）

阅读下面短文，掌握其大意，然后从36—55各题所给的四个选项（A、B、C和D）中，选出最佳选项。

Monday morning always seems to come too soon. Just when you’re getting used to the  36 , it’s already finished. For many of us, Monday is what we  37 , but have no escape from..

So take a deep breath and get your spirits up.  38  you find it hard, here are four  39  to drive the Monday blues away.

Just get  40 . The best thing to do on a Monday morning is to get some exercise or go for a  41  that gets your feel-good hormones (情绪)working. Just find a green spot to have a walk  42  even just sit there. Fresh air, sunshine and green plants can put you in a better  43  .

Turn the music on.. When you’re back from your walk, nothing  44  better than listening to some music. Get your favorite,  45  your music system and let the music set the tone for the day.

46  you best. Make Mondays your look-my-best  47 . Wear the clothes you like most. Even if it means wearing that red shirt you were  48  for a special occasion. Instead of grays and blacks, go for  49  colours. Some of that sunshine yellow or red will drive the  50  away.

Eat happy. For those  51  lovers, bring out your favorite chocolate and eat it all by yourself, right in the  52  .Nothing is better than the guilty(内疚的)  53  of early morning chocolate. You say you’re on a  54 ? Then make Monday your free day. Food is the best way to  55  the blues.

Remember, the next weekend’s just five days away!

36．A．Saturday   B．Sunday     C．weekday   D．weekend

37．A．like B．hate   C．appreciate D．disagree

38．A．In case     B．Once C．As soon as       D．Although

39．A．steps B．ways C．ideas D．procedures

40．A．down       B．off    C．out    D．back

41．A．drive B．rest   C．visit  D．walk

42．A．and   B．or     C．but    D．than

43．A．mood       B．place C．office       D．feeling

44．A．proves      B．does  C．works       D．sounds

45．A．turn down B．turn up     C．turn off    D．turn on

46．A．Dress       B．Look C．Wear D．Choose

47．A．day   B．person      C．chance      D．moment

48．A．making     B．saving      C．preparing  D．buying

49．A．bright       B．red    C．dark  D．beautiful

50．A．yellow      B．blue  C．white D．orange

51．A．chocolate  B．diet   C．food  D．vegetable

52．A．bedroom   B．morning   C．night D．home

53．A．excitement       B．taste  C．pleasure    D．attraction

54．A．diet   B．duty  C．weight      D．beauty

55．A．attack       B．beat   C．compare   D．Meet

沿河及受水浸淹的路基的设计标高，一般应高出规定洪水频率计算水位( )以上。

A．0.2m

B．0.5m

C．0.8m

D．1.0m

哪项是糖尿病最基本的病理生理改变（）

A.极度肥胖

B.长期大量摄糖

C.长期使用糖皮质激素

D.老年

E.胰岛素分泌绝对或相对不足