600mm轨道弯道外轨超高不得超过（）mm。A、40 B、50 C、60

Of all living creatures on earth, insects are the most plentiful. Some 1 are very useful to man, for example, bees, 2 we get honey and wax, and silkworms, which 3 us with silk. Other varieties, 4 , are extremely harmful, and do a great 5 of damage, especially to crops. Locusts are perhaps the most dangerous of all, 6 they will eat almost any green 7 , and when millions of them 8 on cultivated land they soon leave it 9 . In some countries they are the farmers’ 10 enemy. Another nuisance is the common 11 , not only because it 12 us indoors and out-of-doors, but because it spreads diseases.

　　Scientists have given much time and 13 to the study of insects. It needs the most careful and 14 observation. Thanks 15 their discoveries we now know almost all 16 is to be known about the habits of these hardworking insects, bees and ants, which live in 17 better planned in some ways than our 18 . But the most valuable work has been done in trying to give 19 to men, animals and crops from the 20 which insects cause.

1．A．members            B．forms        C．qualities           D．varieties

2．A．by which            B．from which     C．of which           D．in which

3．A．give                B．produce        C．offer              D．supply

4．A．however             B．meanwhile     C．offer             D．supply

5．A．majority             B．number        C．amount           D．what’s more

6．A．and                 B．for            C．if                D．when

7．A．grass               B．field          C．fruit              D．plant

8．A．settle               B．attack         C．pass              D．cross

9．A．bare               B．nothing        C．empty             D．untouched

10．A．hardest            B．greatest        C．serious            D．wildest

11．A．insect              B．creature       C．fly               D．enemy

12．A．dislikes            B．bites          C．worries           D．hates

13．A．understanding       B．ideas           C．comprehension      D．thought

14．A．serious            B．patient        C．curious           D．long

15．A．for                B．of            C．to                D．with

16．A．that               B．which        C．there             D．what

17．A．societies            B．crowds        C．teams             D．organizations

18．A．world              B．nation       C．selves             D．own

19．A．help              B．protection    C．living             D．defense

20．A．injury              B．wound       C．sickness            D．ruin

移种管路的灭菌时间为（）

A、0.5h

B、1h

C、1，5h

D、2h

从掩护物后面进行观察可以使用的方法有（）。

A.探头观察

B.斜角线观察

C.使用镜子观察

D.站出来观察

下列关于次优决策模型表述正确的有（）

A.决策目标明确

B.期望水平随环境条件的变化而变化

C.期望水平随个人体验的变化而变化

D.搜索方法基于满意原则

构建社会主义和谐社会，要以解决人民群众最关心、最直接、最现实的利益问题为重点。什么是这些利益问题，一定要深入实际深入群众中去倾听、了解。除了深入下去调查研究以外，必须有上得来的社情民意表达渠道，形成科学有效的利益诉求表达机制。这种表达渠道和表达机制是构建社会主义和谐社会过程中______。填入横线部分最恰当的一项是()。

A．化解矛盾的手段

B．科学规范的保障

C．产生的新目标、新任务

D．作出正确决策的前提和基础