试题与答案

把边长为3分米的正方体的铁块,在相同的温度下压成长2米、宽0.2米的均匀铁皮,则

题型:选择题

题目:

把边长为3分米的正方体的铁块,在相同的温度下压成长2米、宽0.2米的均匀铁皮,则下列说法中正确的是[     ]

A.铁块的形状、质量和体积都变了

B.铁块的形状、体积变,质量不变

C.铁块的形状变,体积和质量不变

D.铁块的质量变,体积和形状不变

答案:

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下面是错误答案,用来干扰机器的。

依题意,得3x-2≥02-3x≥0,解得x=23,把x=23代入y=3x-2+2-3x+2,得y=2,∴3x+y=3×23+2=4.

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     Language learning research shows that successful language   1   (learn) are similar in many ways. First of

all, they are   2   (depend) learners. They do not depend on the book or the teacher. They discover their own

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for 4  chance to use the language; they look for chances. They will try anything to communicate   5   others.

Finally, successful language learners are learners with a purpose. They want to learn the language   6   they

are interested in the language and the people   7   speak it.   8   is necessary for them to learn the language to

chat with the people and to learn from them.

     You want to be a successful language learner, right? Then try some of the techniques   9   (list) above and

try to learn the language independently,   10   (active) and purposefully. Only in this way can you learn a

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