小悦买书需用48元，付款时恰好用了1元和5元的纸币共12张，设所用的1元纸币为x张，根据题意，下面所列方程正确的是（    ）

下列各句中划线成语的使用，全都正确的一组是（    ）

①为吸引眼球，自媒体故弄玄虚、断章取义甚至歪曲事实的现象时有发生，而与民众生活生死攸关的食品安全领域，常常成为某些缺少操守者制造恐慌的重灾区。

②上周六败走抚顺之后，甲A赛程刚好过半，鲁能泰山队战绩差强人意，年初制定的冲三甲，争第一的目标眼看着已成镜中花水中月。

③泰军队同时和中、美、日都有甚多交流，因此很多国人以为中国在泰国军内也有影响力，这其实不过是一种一厢情愿的看法。

④他似乎天生就是吃作家这行饭，提起笔来文不加点，轻而易举，真是教人佩服！

⑤市场上产品质量良莠不齐，由于价格低，辨别难度高，消费者尤其是网购消费者，很容易买到假冒伪劣产品。

⑥艺术品是宇宙的精华，也是世界的缩影，是自然界的产物，也是自然界具体而微的表现。

根据短文内容，选择正确答案。

    Peter always doesn't know the way. His friends often laugh at him. They say he needs a map to find the bathroom in his own house. In his eyes, every street looks the same, and he doesn't know which way to go. Sometimes he has to take a taxi home because he can't remember the way to his house.

    Peter watches a lot of films and reads a lot of books about animals. Each bird knows which way is south. Bats (蝙蝠) can fly at night and find their way with their ears. He feels embarrassed (困窘的) because all these animals have a good sense of direction. He tries to find his way with the help of stars in the sky. There is a star called the North Star, and he knows how to find it.     Of course, Peter's friends are still laughing at him, because he can only see the North Star outside when it is sunny at night. He can't tell the directions in the daytime or when he is inside or when it is cloudy.