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缺氧是飞行员常见问题，缺氧后三大营养素的代谢都会发生改变。

缺氧时糖代谢的主要改变是（）。

A.有氧氧化增强

B.有氧氧化减弱

C.糖异生作用增强

D.酵解作用增强

E.无氧酵解减弱

答案

参考答案：D

解析：1.蛋白质代谢的主要改变是分解代谢增强。2.缺氧后脂肪代谢的主要改变是尿中酮体排出量增加。3.缺氧后糖的代谢主要改变是酵解作用增强。

听力题

At the beginning of the term, a campaign” to be a good student and a good citizen” was launched in our school, and great changes have taken ________ since then.

Before the campaign, we u_____ to be late for school and failed to hand in our homework in t____.Often, we forgot to greet our teachers and after class we ______(发出)loud noises. Worse still, we jumped the quene when waiting ______ buses. However, the campaigns have changed us a lot. We are no longer late for school and more______(认真)in our homework. We have learned to show______(尊敬)for the elders, help others and give up seats to other passengers.

The campaign is a very good experience, from_____ we have learned a lot. More importantly, we have g___rid of many bad habits becoming better students at school and better citizens in_____（社会）
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问答题 简答题

面安装工艺的焊接方法有几种？它们各有什么特点？
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