听力原文:W: Mark, how do you feel about the company's lay-off decision? M: Well, as far as I'm concerned, it's regrettable, but it's necessary, I'm afraid. What does Mark think about the company's lay-off decision?
A.
He is afraid of being fired.
B.
He is concerned about it.
C.
He doesn't think it is a good decision.
D.
He thinks it is both regrettable and necessary.
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【简答题】在G - 细菌细胞壁中缺乏的化学成分是A. 肽聚糖 B. 磷壁酸 C. 类脂质 D. 蛋白质