— I haven't ________ Mike for a long time.
—I think maybe he is too busy to write to you.
A:heard from
B:asked for
C:got along with
三角形组成的结构不但牢固稳定,而且用料最少。( )
(2014·台州)如图为某人饭后四小时内血糖含量的变化曲线。下列叙述正确的是( )
若函数f(x),g(x)分别是R上的奇函数、偶函数,且满足f(x)-g(x)=ex,则有( )
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碧玉妆成一树高,万条垂下绿丝绦。
不知细叶谁裁出,二月春风似剪刀。