连词成句。

1. have in we Christmas England (.)

    ______________________________

2. at songs Christmas sing they (.)

    ______________________________

3. sweets eat at we Christmas (.)

    ______________________________

4. New Year today Chinese it is (.)

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皮肤黏膜出现发绀时，毛细血管血液还原血红蛋白至少超过（）

A.75g／L

B.50g／L

C.100g／L

D.45g／L

E.30g／L