静态轨道衡计量准确度一般为（）。A、0.15级 B、0.1级 C、0.2级 D、0.

运筹学的主要研究对象是各种有组织系统的（）问题及经营活动。

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

     We are all called upon to make a speech at some point in life, but most of us don't do a very good

job.    1   .

     So, you have to give a speech-and you are terrified. You get nervous, you forget what you want to

say, you stumble (结结巴巴) over words, you talk too long, and you bore your audience. Later you think,

"Thank Goodness, it's over. I'm just not good at public speaking. I hope I never have to do that again."

     Cheep up!    2   . Here are some simple steps to take the pain out of speech making. Ask yourself the

purpose of your speech. What is the occasion? Why are you speaking? Then, gather as many facts as you

can on your subject. Spend plenty of your time doing your research. Then spend plenty of your time

organizing your material so that your speech is clear and easy to follow. Use as many examples as possible,

and use pictures, charts, and graphs if they help you make your points more clearly.     3   . Don't talk over

their heads, and don't talk down to them. Treat your audience with respect. They will appreciate your

thoughtfulness.

     Just remember: Be prepared. Know your subject, your audience, and the occasion. Be brief.    4   . And

be yourself. Let your personality come through so that you make person-to-person contact with your

audience.

     If you follow these simple steps, you will see that you don't have to be afraid of public speaking. In

fact, you may find the experience so enjoyable that you volunteer to make more speeches! You're not

convinced yet?    5   .

A. It doesn't have to be that bad.

B. Take several deep breaths before your speech.

C. This article gives some advice on how to give a good speech.

D. Say what you have to say and then stop.

E. Don't say what you aren't familiar with.

F. Never forget your audience.

G. Give it a try and see what happens.

菟丝子将其不定根伸入到豆科植物的维管束内，吸收水分和养料。这两种植物的关系属于（）。

A．共生

B．寄生

C．竞争

D．捕食

《历史文化名城名镇名村保护条例》中明确规定了其保护规划的基本要求是( )，

A．历史文化名村保护规划的规划期限应当与村庄规划的规划期限相一致

B．保护规划应当自历史文化名城、名镇、名村批准公布之日起2年内编制完成

C．历史文化名镇、名村批准公布后，所在地乡级人民政府应当组织编制历史文化名镇、名村保护规划

D．历史文化名城批准公布后，历史文化名城人民政府应当组织编制历史文化名城保护规划

E．经依法批准的保护规划，不得擅自修改；确需修改的，保护规划的组织编制机关应当向原审批机关提出专题报告，经同意后，方可编制修改方案

ERG