化学是分子、原子水平上研究物质的组成、结构、性质以及变化的一门基础自然科学。

    This week, we’re preparing for one of the newest ____(tradition) events in our country: Black Friday. It’s that crazy gathering of retail (零售)-related violence, a time____stores offer once-a-year promotional sales to set off the customers’ greediness and jump-start the Christmas shopping season with a sudden activity in a ____ (crowd) space.

    The general feeling has been set by the Hamleys Christmas Toy Parade in London, in which 800,000 people ran into Regent Street, apparently attracted by ____possibility of a “meet-and-greet” with Peppa Pig that sadly ____(have) to be cancelled at the last moment on safety grounds. As it was, a middle-aged woman ____(report) had to be taken to hospital after ____ (knock) to the ground in a fight with another woman.

    For the people who dislike shopping, such as me, any day with shopping in it is a black day, and Black Friday is the most worrying ____all. However, I can see the reasoning for retailers. Why spend a lot of money on newspaper ads, when you can offer 50 iPhone Xs at £5 each to the first fifty____(consume)? The related media ____ (cover) of the resulting disorder is, as they say, priceless.

下列四幅剖面图所示地层中，最有可能储存石油、天然气的是（    ）

    Some boys like wearing the same kinds of clothes as girls, and some of them have long hair. So sometimes it's hard to tell whether(是否) they are boys or girls.

    Today is Sunday. I have a walk with my grandmother in the park. My grandmother is 80 years old and she can't see well. After some time, my grandmother is tired(疲倦的), so she sits down on a chair. There is another person sitting on the chair, too.

    “Hello,” my grandmother says to the person with long hair next to her. “Can you see the girl with long hair under the big tree?”“The girl?” says the person, “No, he's my brother Mike.”

    “Oh, sorry. I don't know you are his sister.” Says my grandmother.

    “No, I'm not his sister, I'm his brother!”