题干
—The passage is too hard to understand.
—Yes, ________ it's very short and there are no few words in it.
A：so
B：as
C：because
D：though
答案(点此获取答案解析）
D
—The passage is too hard to understand.
—Yes, ________ it's very short and there are no few words in it.
A：so
B：as
C：because
D：though
；（1）加聚反应（2）加成反应 （3）使酸性高锰酸钾溶液褪色（4）与NaHCO3溶液反应放出CO2气体 （5）与KOH溶液反应．
