连词成句我最棒。

1. need, a, I, stamp  

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2. are, sending, Where, you, your, letter  

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3. is, This, the, of, postcard, top, the  

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4. envelope, How, for, much, the

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影响眼轴长度和角膜屈率测定的因素有

A．眼球有外力压迫

B．眼球未能固视

C．角膜上皮不完整

D．角膜计的轴向与眼轴不一致