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【单选题】
已知 是以2为周期的偶函数，当 时， ，那么在区间 内，关于 的方程 （其中 走为不等于l的实数）有四个不同的，则 的取值范围是( )A.
B.
C.
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举一反三
【简答题】辐射诱变的发生频率一般和______成正比，而与______无关。倘若照射的______不变。不管单位时间内照射的______多少，基因的______总是保持一定。
【单选题】Mum wants to tell her boys ______.
A.
how difficult it is to raise them
B.
how difficult is it to raise them
C.
how difficult to raise them
D.
how difficult is to raise them
【单选题】How difficult is it for you to focus on one thing at a time?
A.
quite difficult
B.
sometimes difficult
C.
not at all difficult
【简答题】短文填空 I know how easy it is to start smoking and how difficult it is to stop. During adolescence, I became 1 to cigarettes. When l was young, I didn't know that it could do 2 to my heart and lungs. Nei...
【简答题】Brave it out, no matter how difficult it is.
【简答题】What is the sky？ Where is it？ How bright is it？ What lies above it？ These questions are difficult to answer, aren’t they？ Is the sky blue？ The sky has no color. We know that there is air around the wo...
【简答题】A．How difficult it is to learn to ride a bicycle. B．It is impossible to learn to ride this bicycle. C．How difficult it is to learn a new software package. D．To learn to ride a bicycle is the same thin...
【单选题】This passage is largely about
A.
how difficult it is to become a doctor in America.
B.
how American medical education has developed in history.
C.
how nice the American medical education system is.
D.
how to become a good doctor.
【判断题】It is important for the teacher to show students how easy it is to understand something from authentic materials rather than how difficult it is to understand everything.（）
A.
正确
B.
错误
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