免疫球蛋白型及亚型的分类依据是（） A.VH抗原性的不同 B.CL抗原性的不同 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。

How to Become a Top Student

Successful students use different techniques to study, which brings them more success.    小题1:    Here are the four techniques almost all top-performing students use.

They are regular. Almost all successful students study regularly, because they know “what you give is what you get”. If you put in regular hours of studying, then you will learn more and get better grades.    小题2:   This will help you to study regularly.

They have clear goals. All top-performing students have definite, specific goals.    小题3:    They motivate you and drive you to study more. But make sure that you do not get carried away. Set realistic goals which can challenge you, but do not seem impossible or too difficult to achieve.

They study without strain (压力). Successful students study a lot. But they study without putting strain on themselves. Most students make the mistake of studying too hard or studying continuously for a long time.    小题4:   Studying should be done in a balanced manner. Take a break for a few minutes, after studying for 30 or 45 minutes. Relax, walk around your room or house, or drink some water and return to studying. Such short breaks will refresh your brain and you will learn more.

  小题5:   Studying is not something you do just because your parents ask you to do it. It’s actually very important for you. Studying gives you knowledge and skills that will remain with you for the rest of your life. It gives you the ability to get a job and earn money. And successful students recognize the value of studying well. 

A．This creates tension and actually slows down learning and memory.

B．But to score A grade in English, you should make well-planned efforts.

C．Set aside some hours, each day or each week, for studying.

D．Having such goals gives you a purpose to study better.E. Learn their techniques, and you will also join their rank.

F. They finish their homework on time.

G. They give importance to study.

患者，女性，32岁，自诉"胆小怕痛"曾有"晕针史"，检查见右下颌第二前磨牙残根，根尖瘘管挤压无脓，治疗设计为局麻下拔除，麻醉顺利，10min后测试麻醉效果良好，开始操作，术中患者感觉疼痛但可耐受，其后自诉头晕、胸闷、心慌、恶心，检查患者面色苍白，四肢冷而无力，脉快而弱。

关于造成上述症状的病因中错误的是（）。

A.过敏体质

B.疼痛

C.恐惧

D.体位不良

E.饥饿

小明同学身高1.65m，他站在竖直放置的平面镜前2 m处，他在镜中的像高为      m，若他向平面镜靠近，像的大小将       。（填“变大”、“变小”或“不变”）

“严禁任何组织和个人向未成年人出售、出租或者以其他方式传播淫秽、暴力、凶杀、恐怖等毒害未成年人的图书、报刊、音像制品。”这句话反映了我国法律所规定的少年儿童合法权利中的（）。

A．受教育的权利

B．生存的权利

C．安全的权利

D．受尊重的权利

接地继电器为双线圈结构，分为动作线圈和（）线圈。