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在线性回归分析中,确定直线回归方程的两个变量必须是(ADE)
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The _______ of human knowledge are being pushed further. (分数:1 分)
A. boundaries
B. limits
C. borders
D. edges
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______ they are twin sisters, they don’t look like each other.( )(本题2.0分)
A、 Because
B、 Since
C、 Though
D、 However
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Without water, _________ no plants or animals. (分数:1 分)
A. there will be
B. there would be
C. there have been
D. there is
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______ is known to all, too much stress can cause mental disease. (分数:1 分)
A. Which
B. It
C. As
D. That
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