Another exception is that very odd liquid, water, which has many strange properties (特性). As water gets colder it contracts (收缩), which is ordinary behavior, until it reaches the temperature of 30℃. above freezing point. After that, as it gets colder, it expands. This is fortunate---for considering the freezing of a pond. As the water on top gets colder, it shrinks; and so, volume for volume, it becomes heavier and sinks. This goes on until all the pond is at 30℃, but after that, as the water becomes colder it expands. Therefore the colder water stays on top and freezes, covering the pond with ice. If the water went on contracting down to the freezing point, the pond would become a solid block of ice in the end. This would not worry people who live in hot climates, but it would be very serious for those who live in cold climates, especially for those who want to break the ice and catch fish which live in the cold water beneath.

　　1. Invar is valuable for making pendulums because _______.

　　A. it can hardly change its shape or size as temperature changes.

　　B. it will change its dimensions without the change of temperature.

　　C. its time of vibration doesn’t change if its length changes.

　　D. its time of vibration does not change if its length changes.

　　2. As water gets colder after reaching the temperature of 30℃. it will _______.

　　A. contract

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