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【单选题】
It's an annual back-to-school routine. One morning you wave goodbye, and that【C1】______evening you're burning the late-night oil in sympathy. In the race to improve educational standards,【C2】______are throwing the books at kids.【C3】______elementary school students are complaining of homework【C4】______. What's a well-meaning parent to do? As hard as【C5】______may be, sit back and chill, experts advise. Though you've got to get them to do it,【C6】______helping too much, or even examining【C7】______too carefully, you may keep them【C8】______doing it by themselves. '! wouldn't advise a parent to check every【C9】______assignment,' says psychologist John Rosemond, author of Ending the Tough Homework. 'There's a【C10】______of appreciation for trial and error. Let your children【C11】______the grade they deserve.' Many experts believe parents should gently look over the work of younger children and ask them to rethink their【C12】______. But 'you don't want them to feel it has to be【C13】______',she says. That's not to say parents should【C14】______homework w first, they should monitor how much homework their kids【C15】______. Thirty minutes a day in the early elementary years and an hour in【C16】______four, five, and six is standard, says Rosemond. For junior-school students it should be '【C17】______more than an hour and a half', and two for high-school students. If your child【C18】______has more homework than this, you may want to check【C19】______other parents and then talk to the teacher about【C20】______assignment. 【C1】
A.
very
B.
exact
C.
right
D.
usual
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【多选题】可供市场跟随者选择的跟随战略有( )
A.
紧密跟随
B.
市场跟随
C.
距离跟随
D.
选择跟随
E.
产品跟随
【单选题】已知 ,则下列结论中不正确的是 [     ]
A.
函数y=f(x)·g(x)的最小正周期为π
B.
函数y=f(x)·g(x)的最大值为
C.
函数y=f(x)·g(x)的图象关于点( ,0)成中心对称
D.
将函数f(x)的图象向右平移 个单位后得到函数g(x)的图象
【单选题】已知反比例函数 ,下列结论中不正确的是(  )
A.
图象经过点(-1,-1)
B.
图象在第一、三象限
C.
两个分支关于原点成中心对称
D.
当x<0时, 随着 的增大而增大
【多选题】分子的分子量,可以选择哪种质谱技术
A.
EI
B.
ESI
C.
FAB
D.
CI
【简答题】下列结论中正确的是 (填上所有正确结论得序号) ①对于函数 ,若 ,使得 ,则函数 关于直线 对称; ②函数 有2个零点; ③若关于 的不等式 的解集为 ,则 ; ④已知随机变量 服从正态分布 且 ,则 ; ⑤等比数列 的前 项和为 ,已知 ,则
【多选题】可供市场跟随者选择的跟随战略有
A.
紧密跟随
B.
市场跟随
C.
距离跟随
D.
选择跟随
【单选题】下列结论中不正确的是( ).
A.
若f’(x 0 )=0,f"(x 0 )=0,则不能确定点x=x 0 。是否为函数的极值点
B.
若x=x 0 是函数f(x)的极值点,则f’(x 0 )=0或f’(x 0 )不存在
C.
函数f(x)在区间(a,b)内的极大值一定大于极小值
D.
f’(x 0 )=0及f’(x 0 )不存在的点x=x 0 ,都可能是f(x)的极值点
【单选题】下列结论中不正确的是(    ).
A.
若f'(x 0 )=0,f"(x 0 )=0,则不能确定点x 0 是否为函数的极值点
B.
若点x 0 是函数f(x)的极值点,则f'(x 0 )=0或f'(x 0 )不存在
C.
函数f(x)在区间(a,b)内的极大值一定大于极小值
D.
f'(x 0 )=0及f'(x 0 )不存在的点x 0 ,都可能是函数的极值点
【简答题】下列四个结论中,正确结论的序号是 ①函数 与 的图像关于直线 对称;②为了得到函数 的图象,只需把函数 的图象上的所有点向右平移 个单位长度; ③当 或 时, 幂函数 的图象都是一条直线;④已知函数 , 若 互不相等,且 ,则 的取值 范围是 .
【简答题】阿细跳月阿细语称“嘎斯比”,即 之意。
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