关于晶体和化学键关系的下列说法中，正确的是

阅读短文，做出正确的判断，正(√)误(×)。

     This is me. I'm Dong Yan. I'm from Harbin, a beautiful city. It's very cold there in winter. But it's

warm in my room. In the picture, I'm wearing a thick coat and warm shoes. I'm making a snowman

with my friends. We are very happy. I like ice skating and I can do it very well. 

( )1. Harbin is a nice city. 

( )2. It's warm there in winter. 

( )3. In the picture, Dong Yan is making a card. 

( )4. Dong Yan can do ice skating very well. 

( )5. Dong Yan doesn't like making a snowman.

以下检查中提示胎膜早破的是（）。

A. * * 液干燥片检查有羊齿状结晶出现

B. * * 酸碱度检查，流出液PH值为7.0

C. * * 酸碱度检查，流出液PH值为5.0

D. * * 酸碱度检查，流出液PH值为6.0

E.羊膜镜检查，可直视胎先露，看不到前羊水囊

男，21岁，发热，左上肢剧痛半月余，结合影像学检查，最可能的诊断是（）

A.骨肉瘤

B.骨样骨瘤

C.骨结核

D.骨巨细胞瘤

E.骨髓炎

张先生，70岁，因心力衰竭住院已3周，体质虚弱。近日骶尾部皮肤破溃，床位护士仔细观察后认为是压疮炎性浸润期。

病人出现局部症状的主要原因是（）。

A.局部受压过久

B.营养缺乏

C.缺少活动

D.精神紧张

E.心肌缺血

Which of the following is the best example of a structural change as opposed to a cyclical change（）

A. Increased spending from an increase in consumer confidence. 

B. The European Central Bank raises interest rates to ward off inflation.

C. The average age of consumers increasing.