题干
38.____________in 1914____________the First World War broke out?
39.
A：Was that, that
B：Was that, whe
C：Was it. that
D：Was it, whe
答案(点此获取答案解析）
C
A：Was that, that
B：Was that, whe
C：Was it. that
D：Was it, whe
，它能代替聚苯乙烯．它是由乳酸（一种有机酸）缩聚而成，能在乳酸菌的作用下降解而不会污染环境．下列关于聚乳酸的说法正确的是（ ）