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【单选题】
若将n阶下三角矩阵A按列优先顺序压缩存放在一维数组B[1…n(n+1)／2]中，则存放到B[k]中的非零元素aij(1≤i，j≤n)的下标i、j与k的对应关系是（ ）。A.
(i-1)(2n-j+1)／2+i-j
B.
(j-1)(2n-j+2)／2+i-j+1
C.
(j-1)(2n-j+2)／2+i1
D.
(j-1)(2n1+1)／2+i-j-1
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【简答题】A smart toaster can sense when the bread is the chosen shade of brown.
【单选题】The bread is so delicious and it was _____ yesterday.
A.
out of season
B.
out of service
C.
out of stock
D.
out of sight
【单选题】The bread is __ than these cakes
A.
very delicious
B.
much delicious
C.
more delicious
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A.
正确
B.
错误
【单选题】the chair is made_____ wood and the bread is made_____corn
A.
of ..... from
B.
from ....of
C.
of..... in
D.
from .....in
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