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【单选题】
Now people can with their friends far away by e–mail, cellphone or letter.
A.
keep on                 
B.
keep in touch          
C.
keep up
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举一反三
【多选题】关于合成培养基,以下说法正确的是
A.
成分明确
B.
配制复杂
C.
适于大型工业发酵
D.
适于富集少量的目的微生物
【单选题】I _____ in New York for two years, but I’ve never regretted my final decision to move back to my motherland.
A.
worked
B.
was working
C.
have worked
D.
had worked
【简答题】It was the district sports meet. My foot still hadn’t healed(痊愈)from a(n)  injury. I had  whetherIt was the district sports meet. My foot still hadn’t healed(痊愈)from a(n)____injury. I had____whether o...
【简答题】Before I left to meet Lynne, my friend told me that I had better take some money, but I didn’t listen to him. I thought that Lynne would pay because she invited me. I arrived at the restaurant on time...
【单选题】转炉吹损的主要部分是()。
A.
机械吹损
B.
化学吹损
C.
烟尘及炉渣中铁的损失
【单选题】转炉吹损的主要部分是( )。
A.
机械吹损
B.
化学吹损
C.
烟尘及炉渣中铁的损失
D.
喷溅造成的铁损
【单选题】转炉吹损的主要部分是( )。
A.
机械吹损
B.
化学吹损
C.
烟尘及炉渣中铁球损失
【单选题】I had to meet my mother at the railway station as she ______ before.
A.
had never been
B.
has never been
C.
has never come
D.
had never come
【单选题】I had to meet my mother at the railway station as she _______ before.
A.
had never been here
B.
has never been here
C.
has never come here
D.
had never come here
【单选题】转炉吹损的主要部分是()
A.
机槭吹掼
B.
化学吹损
C.
烟尘及炉渣中铁的损失
D.
喷溅造成的铁损
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