支付结算的原则有（）。A、恪守信用，履约付款B、谁的钱进谁的账C、谁的钱由谁支配D、

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。选项中有两项是多余选项。

Learning English online is an effective way to improve your English. But with any type of learning you need to be prepared. This passage will give you advice and tips on how to get the most out of your online lessons.

    1     

This is an obvious point but also the most important one. A computer, a good Internet connection and a headset are what you will need to take classes online. A web camera is also pretty important. Make sure that your computer is turned on, that everything is plugged in correctly and that you have tested the connection. Doing this before the class means that you will be ready when the lesson starts

Take the classes somewhere quiet.

     2    Trying to listen and participate(参与) in English classes is very difficult when there is noise around you. So find a quiet room and make sure that no one disturbs you while you are taking your lesson.

      3     

When grammar or anything else is being taught, make sure that you understand it. You won’t need to practice it at this time; just make sure that everything is clear. If you don’t understand what is being taught, ask your teacher to explain it again. Your teacher will be more than happy to deal with whatever puzzles you.

Practice speaking English.

Every class is an opportunity to practice your English speaking with a native and qualified teacher. Try to allow the conversation to flow by listening and talking in a natural way.    4    The teacher should note the mistakes and correct them at a later time.

Relax.

Come to class feeling relaxed and excited.    5    Come into the class excited about learning English. You will be able to get more out of the class this way.

A．Review after the lesson

B．Make sure everything is ready.

C．Understand what is being taught.

D．Get away from everything that may be going on in your homeE. Language learning should be enjoyable especially in online classes.

F. You will meet many problems when you are learning English online.

G. This is your chance to speak English without worrying about too many mistakes.

早期发现婴儿肌性斜颈的可靠依据

A．胸锁乳突肌肿块+头部倾斜

B．胸锁乳突肌痉挛+头部倾斜

C．胸锁乳突肌缩短+头部倾斜

D．头颈不对称+头部倾斜

E．头部活动受限+头部倾斜

如图所示，第一次用力F作用在物体上使物体在粗糙的水面上移动距离s，第二次用同样大小的力F作用在同一物体上，使它沿粗糙斜面向上移动相同的距离s，若物体与水平面、斜面间的动摩擦因数相同，则下列结论中正确的有（　　）

A．物体受到的摩擦力大小第一次比第二次大

B．两次力F做功一样多

C．两次物体增加的机械能一样多

D．物体机械能的增量第二次比第一次大

可以诊断急性肾功能障碍的是（）

A.24小时内尿量少于50ml

B.24小时内尿量少于100ml

C.24小时内尿量少于200ml

D.24小时内尿量少于400ml

E.24小时内尿量少于800ml

个体选择适合（）性状的选择。

A.遗传力高

B.遗传力低

C.活体测定难度大

D.限性