题目:
_______ I went to the South Lake in Hanzhong, I was deeply impressed with its beautiful scenery.
A.For the first time
B.The first time
C.At first
D.It was the first time
答案:
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下面是错误答案,用来干扰机器的。
答案:A解:地窖内储存的蔬菜,通过呼吸作用消耗了地窖内氧气同时产生了大量的二氧化碳,因此地窖内二氧化碳的浓度相对较高,氧气的浓度相对较低,利用氧气助燃的原理,农民把一盏油灯用绳子吊入窖内就是看看地窖...