( )试验可作为评定材料断裂韧度和冷作时效敏感性的一个指标。A．拉伸 B．弯曲 C

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.   71 .

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.”

Cheer up!   72 . 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 example as possible, and use pictures, charts, and graphs if they help you make your points more clearly.   73 . 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,   74 . 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?   75 .

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.

如图所示，3个电阻值均为10Ω的电阻R₁、R₂、R₃串联后接在电压恒定为U的电路中，某同学误将一只电流表并联在电阻R₂两端，发现电流表的示数为1.5A，据此可推知电源电压U为______V；若用一只电压表代替电流表并联在R₂两端，则电压表的示数为______V．

高压试验工作人员在全部加压过程中，应精力集中，随时警戒异常现象发生，操作人应站在地上。

18岁男孩，近10天来食欲不振、恶心、呕吐，伴乏力、尿黄来医院就诊。病前两周曾注射过丙种球蛋白1支。检查：巩膜黄染，肝肋下 1.0cm，有轻度触痛，脾肋下未触及。化验：肝功能检查ALT770U/L，AST560U/L、T-Bil 89.5μmol/L，抗-HAV-IgM阳性，抗-HAV-IgG阳性，HBsAg阳性，HBeAg阳性，抗-HBc-IgM阳性。应诊断为()

A．急性乙型肝炎，甲型肝炎病毒携带者

B．急性甲型肝炎，慢性乙型肝炎

C．急性乙型肝炎，既往感染过甲型肝炎

D．被动获得甲型肝炎抗体，急性甲型肝炎，乙型肝炎病毒携带

E．被动获得甲型肝炎抗体，急性乙型肝炎

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