C. could only leap and glide

　　D. could easily open their wings wide

　　2. Modern birds are different from their ancestors in that________。

　　A. they have layers of long feathers

　　B. they have special wrist bones so that they can change directions in midair

　　C. they have a layer of long feathers topped with a layer of short feathers

　　D. they have teeth in the mouth and long bony tails

　　3. What is critical in finding out how feathers came to be the way they are?

　　A. Fossils of ancient birds.

　　B. Tapes of old times.

　　C. Comparing features of reptiles and birds.

　　D. Studying bones and structures of modern birds.

　　4. The passage mainly aims to_。

　　A. explore how birds looked 150 million years ago.

　　B. explore how modern birds developed from ancient reptiles.

　　C. list all the fossils of ancient birds recently discovered.

　　D. look at the evolution of feathers that enabled birds to fly.

　　参考答案1—4、CCAD

　　阅读下列短文, 从给的四个选项 (A、B、C和D) 中, 选出最佳选项。

　　体裁：记叙文　话题：关爱动物　时间：7分钟

　　My husband and I had just opened up a pet sitting business earlier that year.Our customers had slowly risen from three to thirty a month.We were busy through those hot summer months，driving between visits.Our services were strictly held at the pet owner's home.It was almost too busy for the two of us，but we were making good money!

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