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【单选题】
革兰氏阴性细菌细胞壁的主要组成分是（ ）。A.
肽聚糖
B.
磷壁酸
C.
葡聚糖
D.
肽聚糖和磷壁酸
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反馈参考答案：
举一反三
【简答题】( ) 分析是对项目所在国家和地区的整体经济发展状况,以及项目所处行业(产业)和相关行业(产业)的发展状况分析。
【单选题】We were talking and laughing, when our teacher came in and asked us what all the ______ was about.
A.
excite
B.
exciting
C.
excited
D.
excitement
【单选题】Our teacher came in the classroom so we stopped _____ and _____ what the teacher said.
A.
talking; heard
B.
to talk; listened to
C.
to talk; heard
D.
talking; listened to
【单选题】We were copying the new words ________ our teacher came in. [ ]
A.
while
B.
as
C.
when
D.
unless
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