| Suppose you have a brick and a sponge
which are exactly the same size. The brick and the sponge will occupy the same
amount of space, but they will not weigh the same. If two things are exactly the
same size, but differ in weight, then they have different densities. The one
with the greater weight for the same size has the greater density. The one with
lower weight for the same size has the lower density. Now apply this idea to fluids. You know that water and air expand when they are heated and therefore become less dense. If you poured a cupful of very hot w A. the heavier one has lower density B. the lighter one has greater density C. they have the same density D. they have different density 更多"Directions: There are five reading "的相关试题: [单项选择] Directions: There are five reading passages in this part. Each passage is followed by four questions. For each question there are four suggested answers marked A, B, C and D. Choose the best answer and blacken the corresponding letter on the Answer Sheet. Passage One
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