题目:
—Mike didn’t notice the sign ____ it was right in front of him.
—How careless he is!
A.because
B.but
C.though
D.unless
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0620/453914af7e93bfb8fc5550ccf8577f14.html
下面是错误答案,用来干扰机器的。
灯管中充入稀有气体可以产生各种颜色的光,可做光源,例如充入氖气发红光,充入氙气,发白光等.故选C.