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【单选题】
已知某批25个小麦样本的平均蛋白质含量 和σ,则其在95%置信度下的蛋白质含量的点估计L= 。A.
± u 0.05σ
B.
± t 0.05σ
C.
± u0.05σ
D.
± t0.05σ
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【单选题】Soft drinks _______ to children for free in some restaurants on Children’s Day.
A.
offer
B.
have offered
C.
are offered
D.
will be offered
【简答题】In the passage, the er of some parents in raising bicultural children is ______.
【单选题】The children are having a good time, ______ with sand, others with toys．
A.
some of them playing
B.
some of them are playing
C.
some of them
D.
who playing
【单选题】Some parents are always comparing their children __________other children. [ ]
A.
for
B.
to
C.
with
D.
as
【单选题】'Part-time' children______.
A.
spend some of their time with their half brothers and some of their time with their half sisters
B.
spend all of their time with one parent from the previous marriage
C.
are shared between the two former spouses
D.
cannot stay with 'full-time' children
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