单项选择题

在现代人际交往中，馈赠礼物是不可缺少的交往手段。
A、正确
B、错误

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浇注温度不合理对铸件质量的影响情况有哪些？

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Read the following paragraphs and identify what the italicized words refer to. The invention of the Internet is definitely a boon to mankind. It has made life more comfortable and easy. Be it search engines, collaboration software or social media platforms, a few keystrokes and you get to know everything happening around the world. This is a huge transformation compared to the lives that we have been leading two or three decades back. The emergence of portable computers and smart phones has accelerated the shift from the traditional office environment to more diversified workplaces. 1. It (Line 1) ________________________________________ 2. This (Line 3) ________________________________________

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