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【单选题】
啤酒发酵过程中两种酵母，上面酵母浮在表面，下面酵母沉在底部，其原因是 。A.
生长温度不同
B.
菌体重量不同
C.
二氧化碳产生速率不同
D.
发酵培养基不同
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举一反三
【单选题】____, tears came down. [ ]
A.
Hearing the bad news
B.
Heard the bad news
C.
When to hear the bad news.
D.
When she heard the bad news
【简答题】词汇运用。 1. After hearing the bad news, he seemed __________(happy). 2. When I see the sun, I have the feeling of __________(warm) 3. Don't make much noise in the classroom. Many students __________(revi...
【单选题】从事生产、经营的纳税人应当自领取税务登记证之日起的法定时间内，将其财务、会计制度或者财务会计处理办法报送税务机关备案。该法定时间为（ ）。
A.
15日
B.
30日
C.
45日
D.
3个月
【单选题】_____, tears came down.
A.
Hearing the bad news
B.
Heard the bad news
C.
when to hear the bad news
D.
When he heard the bad news
【单选题】When hearing the bad news , I can’t help _____ .
A.
cry
B.
to cry
C.
crying
D.
to crying
【简答题】What should parents do when hearing the child tell a bad story at school?
【单选题】When hearing the bad news , he cry ing.
A.
couldn' t help
B.
couldn' t but
C.
could help
D.
just had to
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