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【单选题】
某研究用甲、方法测量某市10处水源中氟含量（mg/L），采用Wilcoxon符号秩和检验比较两种方法测量结果是否有差别。如果甲、方法测量值之差中有-0.02、0.02，其绝对值的位次是3、4，则这两个差值的秩次分别为（）A.
-3.5，3.5
B.
-3.5，-3.5
C.
3.5，3.5
D.
-3，4
E.
3，4
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举一反三
【单选题】My English teacher warned me（）Chinese in the classroom.
A.
to not speak
B.
don’t speak
C.
to speak not
D.
not to speak
【单选题】The teacher warned that anyone who was caught______during the test would be punished.
A.
being cheated
B.
cheating
C.
to cheat
D.
to be cheating
【单选题】When David came later, the teacher warned that he must be prompt.
A.
punctual
B.
careful
C.
responsible
D.
tardy
【单选题】T he teacher warned Mike computer games for too long.
A.
against playing
B.
f rom playing
C.
against play ed
D.
from play ed
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