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阅读下面文段,按照句子结构的语法性和上下文连贯的要求,在空格处填入一个适当的词或使用括号中词语的正确形式填空,并将答案填写在答题卡的相应位置上。

Many millions of years later, the first 1. (extreme) small plants began to appear on the surface of the water. They multiplied and filled the oceans and seas 2. oxygen, 3. encouraged the later development of early shellfish and all sorts of fish. Next, green plants began to grow on land. They 4. (follow) in time by land animals. Some were insects. 5., called amphibians, were able to live on land as well as 6.the water. Later when the plants grew into forests, reptiles appeared for the first time. They produced young generally by laying eggs. After that, some huge animals, called dinosaurs, developed. They 7. (lay) eggs too and existed on the earth for more than 140 million years. 8., 65million years ago the age of the dinosaurs ended. Why they suddenly disappeared still remains a mystery. This 9. (appear) made possible the rise of mammals on the earth. These animals were different from all life forms in the past, 10. they gave birth to young baby animals and produced milk to feed them.

高一英语语法填空中等难度题

少年,再来一题如何?
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