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通信卫星系统在过去的几十年中取得了很大的成功，已经引起了人们对其未来的广泛关注。Communication satellite systems have been quite a success in the past decades, evoking widespread attention to their future.

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西蒙全心全意为主人服务，所以他无愧于“忠仆”这一称号。Simon serves his master heart and soul, so he deserves the name “man Friday”.

她刚才那一种兴奋又烟消云散。Her high spirits of a moment ago suddenly vanish like smoke and disperse like clouds.

切割金属时，可以看到光亮的表面，但是立刻就变成了灰色。When metals are cut, the shining surface is visible, but it turns grey almost immediately.

1.知觉的基本特征是（）。

A. 整体性
B. 理解性
C. 相对性
D. 恒常性