阅读理解

A

While we are busy buying things for ourselves during festivals, we shouldn’t forget those members in our family, who love us without saying a word — our pets! This year, let’s make the festivals special for them by giving them some awesome gifts.    What else do pets love besides eating and playing? And when it comes to toys, we all know that pets are no different than kids, and every new toy would be welcomed with much excitement.

  Festivals give everybody a chance to dress up and look their best. Why should pets stay behind? Most pet stores have many choices(选择) when it comes to pet outfits(配备). From a cap to a T-shirt, if you want, you can get them in all types and sizes.

  Lastly, and most importantly, we all need love. So do our pets. Don’t ignore(忽视) them. Kiss them, love them, and play with them.

There were some trees before．Now there is a dining hall．

生物种类的多样性实质上是基因____ 的多样性。（判断对错）

具有x个碱基对的一个双链DNA分子片段，含有y个嘧啶。下列叙述正确的是（    ）

撒哈拉以南的非洲被称为（　　）的故乡。