题目

Melbourne, Australia Melbourne is a hot-spot travel destination, and it’s easy to see why with its beautiful beaches and busy city life.    Why it’s a great choice: Australia as a whole is considered a safe destination for international travel, and because of that, many solo travelers go there. As an English-speaking country, you won’t be faced with any language barriers. Melbourne is easy to get around because you can walk or bike practically anywhere!    Thailand    Thailand is great for solo travelers---perhaps because it is one of the Buddhist mindsets, which promote equal若关于x的方程x2-+cosα=0有两个相等的实数根，则锐角α为（ ）A．30°B．45°C．60°D．75°