单项选择题

Considerable research evidence suggests that students who are successful in school are those with enough self-confidence.（）

A．相当多的研究表明，学习成绩最好的学生就是那些有自信心的学生。
B．深入的研究表明，在学校成功的学生是那些有足够自信心的学生拥有者。
C．大量的研究证据表明，在学校学习最好的学生就是那些自信心强的学生。
D．据调查所得证据，那些在学校成功的学生就是有着足够自信心的人。

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单项选择题

Why does the author say that nothing was wasted before the invention of the fridge（）

A．People would not buy more food than was necessary.
B．Food was delivered to people two or three times a week.
C．Food was sold fresh and did not get rotten easily.
D．People had effective ways to preserve their foo