题干

下面四幅图是来自于同一生物体内的、处于四个不同状态的细胞分裂图.下列有关叙述中,正确的是(  )

A:该生物的正常体细胞中含有8条染色体

B:图①与图③所示细胞中DNA含量比例为1﹕2

C:图②与图④所示过程仅发生在某些器官中

D:由图④可知,该生物一定是雄性个体

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答案(点此获取答案解析)

C

同类题2

阅读下列短文,从每题所给的ABC和D四个选项中,选出最佳选项。

A

Washington, D.C. Bicycle Tours

Cherry Blossom Bike Tour in Washington, D.C

    Duration: 3 hours

    This small group bike tour is a fantastic way to see the world-famous cherry trees with beautiful flowers of Washington, D.C. Your guide will provide a history lesson about the trees and the famous monuments where they blossom. Reserve your spot before availability - and the cherry blossoms - disappear!

Washington Capital Monuments Bicycle Tour

    Duration: 3 hours (4 miles)

    Join a guided bike tour and view some of the most popular monuments in Washington, D.C. Explore the monuments and memorials on the National Mall as your guide shares unique

facts and history at each stop. Guided tour includes bike, helmet, cookies and bottled water.

Capital City Bike Tour in Washington, D.C.

    Duration: 3 hour

    Morning or Afternoon this bike tour is the perfect tour for D.C. newcomers and locals looking to experience Washington, D.C.in a healthy way with minimum effort. Knowledge guides will entertain you with the most interesting stories about Presidents. Congress, memories, and parks. Comfortable bikes and a smooth tour route(路线) make cycling between the sites fun and relaxing.

Washington Capital Sites at Night Bicycle Tour

    Duration: 3 hour (7 miles)

    Join a small group hike tour for an evening of exploration in the heart of Washington, D.C. Get up close to the monuments and memorials as you bike the sites of Capitol Hill and the National Mall. Frequent stops are made for photo taking as your guide offers unique facts and history. Tour includes bike, helmet, and bottled water. All rides are equipped with reflective vests and safety lights.

同类题3

阅读理解

    Recently some articles claims the word "selfie" as one of the most annoying words. But I'd like to offer that maybe it is not so bad.

    The “selfie” is used to describe the self-taken photo, often from a smart phone. Women and men decorate their Facebook, Twitter, and Instagram accounts with these pictures, sometimes with puckered (翘起) lips or large smiles. In fact, the selfie has become so widely known that over 31 million photos on Instagram are taken with the selfie.

    Let's think about it. Someone takes about 10 selfies each time they do, and they only end up posting one or two of those. They pick the one that they feel makes them look the best. Isn't that beautiful? In that one picture, someone has given himself or herself confidence. Self-image is important. In society today, we are often so consumed with the feeling that what society tells us is perfect. But maybe, with that one selfie, we feel that we fit that bill. We feel handsome, beautiful, confident, smart, happy and content. For that moment, everything bad or terrible that has ever happened to us is erased (消除), because that smile or that pucker is what gives us the determination to love ourselves.

    I saw a spoken word poem recently and the young man said: If I ask you what you love, the answers will most likely roll off your tongue. You love to read. You love to write. You love birds, music, your mom, your brother, your sister, your daughter, your best friend, your dog. How long do you think you can go on and on before you say “I love myself”.

    That statement hit me like a ton of bricks. I've struggled with confidence all of my life. I still do. And in no way am I saying that taking a selfie is a gateway to that confidence. However, the selfie does deserve some credit for allowing individuals to express themselves. Pamela Rutledge agrees, stating, “There are many more photographs available now of real people than models.”