问题
选择题
在①a4·a2;②(-a2)3;③a12÷a2;④a2·a3中,计算结果为a6的个数是 [ ]
A、1个
B、2个
C、3个
D、4个
答案
答案:A
在①a4·a2;②(-a2)3;③a12÷a2;④a2·a3中,计算结果为a6的个数是 [ ]
A、1个
B、2个
C、3个
D、4个
答案:A
从方框中选择恰当的句子补全对话,使对话内容完整。 Sally: Hello ,Tommy! Tommy: Hi, Sally! Sally: Tommy, I lost (遗忘) something at home. I need them now. Tommy: __1__ Sally: I am at school. __2__. Tommy: Yes, I can. What do you need? Sally: I need my notebook, keys, pen and English-Chinese dictionary. Tommy: Your notebook? __3__ . Sally: It's in the drawer. Tomy: I know. __4__ Sally: Mmm..0h! They are on the dresser. Tommy: __5__ Sally: My pen is in the pellcil case and my dictionary is on the bookcase.
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