因素模型中，证券收益率方差的大小只决定于因素的方差大小。

关于月经的描述，下述哪项错误（）。

A.月经初潮多在13～15岁

B.两次月经的第一天间隔的天数称月经周期

C.月经血量一般在100ml左右

D.月经色呈暗红，有小凝血块

E.大多数妇女月经期无特殊症状

MODS患者代谢支持的原则中错误的是（）。

A.早期供给允许性低热卡：20～25kcal/（kg·D.的能量

B.热：氮比值保持在100：1左右

C.尽可能早期使用肠内营养

D.重症患者血糖控制在8～15mmol/L

E.降低代谢率和促进蛋白质合成

患儿，女性，12岁，以发热，乏力、身上有出血点就诊，体检，脾轻度大，胸骨压痛明显，外周血血红蛋白65g/L，血小板9×10⁹/L，白细胞15×10⁹/L，原始细胞占50%，此细胞大小较一致，以小型为主，染色质均匀，浆少，天蓝色，POX(-)

据以上描述，此病最有可能是

A．传染性单核细胞增多症

B．急性淋巴细胞白血病

C．急性粒细胞白血病

D．特发性血小板减少性紫癜

E．浆细胞白血病

阅读理解

     Sometimes you'll hear people say that you can't love others until you love yourself. Sometimes you'll

hear people say that you can't expect someone else to love you until you love yourself. Either way, you've got to love yourself first and this can be tricky. Sure we all know that we're the apple of our parents' eyes, and that our Grandmas think we're great talents and our Uncle Roberts think that we will go to the

Olympics. But sometimes it's a lot harder to think such nice thoughts about ourselves. If you find that

believing in yourself is a challenge. It is time you build a positive self-image and learn to love yourself.

     Self-image is your own mind's picture of yourself. This image includes the way you look, the way you

act, the way you talk and the way you think. Interestingly, our self-images are often quite different from

the images others hold about us. Unfortunately, most of these images are more negative than they should

be. Thus changing the way you think about yourself is the key to changing your self-image and your whole world.

     The best way to defeat a passive self-image is to step back and decide to stress your successes. That

is, make a list if you need to, but write down all of the great things you do every day. Don't allow doubts

to occur in it.

     It very well might be that you are experiencing a negative self-image because you can't move past one

flaw or weakness that you see about yourself. Well, roll up your sleeves and make a change of it as your

primary task. If you think you're silly because you aren't good at math, find a tutor. If you think you're

weak because you can't run a mile, get to the track and practice. If you think you're dull because you

don't wear the latest trends, buy a few new clothes. But remember, just because you think it doesn't mean

it's true.

     The best way to get rid of a negative self-image is to realize that your image is far from objective, and

to actively convince yourself of your positive qualities. Changing the way you think and working on those

you need to improve will go a long way towards promoting a positive self-image. When you can pat(拍)

yourself on the back, you'll know you're well on your way. Good luck!

1. You need to build a positive self-image when you _________.

A. dare to challenge yourself

B. feel it hard to change yourself

C. are unconfident about yourself

D. have a high opinion of yourself

2. How should you change your self-image according to the passage?

A. To keep a different image of others.

B. To make your life successful.

C. To understand your own world.

D. To change the way you think.

3. What is the passage mainly about?

A. How to prepare for your success.

B. How to face challenges in your life.

C. How to build a positive self-image.

D. How to develop your good qualities.

4. Who are the intended readers of the passage?

A. Parents.

B. Adolescents.

C. Educators.  

D. People in general.

早期期货市场具有的特点包括( )。

A．起源于远期合约市场

B．投机者多，市场流动性大

C．实物交割占比重较小

D．实物交割占的比重很大