关于保证合同的签订，下列说法不正确的有( )。A．保证合同可以以口头形式订立 B．

短文改错

     I often quarrel about my mother over whether I can watch TV afterschool. She holds view

that senior three students have to make fully use of every minute to work hard at their lessons.

It seems to me that once I am allowed to do that, I'll unable to control myself and forget all about

my study. She also thinks it is bad for my eye. But I really can't accept her ideas. In my opinion,

watch TV can set my mind at rest after a day's hard works.Besides, it is important for us to know

what had happened at home and at abroad. Thus, we shouldn't be forbidden to watch TV.

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策划是专家知识的组织和集成以及信息的组织和集成的过程，其实质是( )。

A．知识管理过程

B．创新求增值过程

C．开放性过程

D．动态过程

关于X线在物质中衰减的叙述，正确的是

A．X线衰减与X线波长无关

B．X线衰减与透过物质有关

C．线性衰减系数是以长度为单位的衰减

D．质量吸收系数是以质量厚度为单位的衰减

E．总衰减系数是各种衰减系数的总和

歌剧团甲欲在其创作的歌剧中使用作曲家乙创作但尚未发表的乐曲。根据著作权法的规定，下列说法中哪些是正确的？（）

A.甲可以不经乙的许可，但应当向乙支付报酬

B.甲应当获得乙的许可，并向乙支付报酬

C.甲应当获得乙的许可，但不必向乙支付报酬

D.甲可以不经乙的许可，也不必向乙支付报酬