You are given the following experiment to observe:  An ice cube of frozen water is placed into two beakers of clear liquid.  In liquid A, the ice cube floats.  In liquid B, the ice cube sinks.  From these observations, which of the following options correctly lists relative density from least dense to most dense?单项选择题

A

liquid B, ice cube, liquid A

B

ice cube, liquid A, liquid B

C

liquid A, ice cube, liquid B

D

ice cube, liquid B, liquid A

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Clark steps outside on a winter North Dakota morning and throws a rock into the lake outside his tent. He sees that the rock does not sink. Clark forms a hypothesis about the behavior of rocks and water: The colder water is, the slower a rock will sink. Choose an experiment to best test this hypothesis. [ Select ] Get samples of water at a range of temperatures and place rocks of various sizes in each one. Verify if it will sink. Get samples of water at the same temperatures and place an identical rock in each one. Verify if it will sink. Get samples of water at a range of temperatures and place an identical rock in each one. Verify if it will sink. Get samples of water at the same temperatures and place rocks of various sizes in each one. Verify if it will sink. Predict whether this experiment will prove or disprove Clark’s hypothesis. [ Select ] Clark’s hypothesis indicating a continuous relationship would be disproved Clark’s hypothesis indicating a continuous relationship would be proved Clark’s hypothesis indicating a continuous relationship cannot be proved or disproved, If it would be disproved, what would be the revised hypothesis? Below 0°C, rocks do not sink in water.

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Question 30 Choose a, b, c or d as the best answer. The author’s main argument is that the 100:80:100 model __________.

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