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【单选题】
重金属检查中,加入硫代乙酰胺比色时,溶液最佳pH值是A.
1.5
B.
3.5
C.
2.5
D.
﹥7
E.
10.0
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【单选题】My brother _____ the Youth League last year. H e _____ a Youth League member for about a year now.
A.
joined…has become
B.
joined…has been
C.
has joined…has been
D.
did join…had been
【单选题】The 4-H Study of Positive Youth Development looked at_______.
A.
troubled adolescents and institutions that deal with them
B.
activities that successful teens are involved in
C.
how schools change their programs to deal with troubled teens
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【简答题】根据短文内容及首字母提示，填写所缺单词，并将答案填写在答题卡号为72-81的相应位置上。 The Youth Olympic s (YOG) is a new . Like the Olympic s, YOG takes place every 4 years. Only players aged between 14 and 18 can take part in i...
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