Scientists think that there has been life on Earth for   小题1: (百万) of years. How

题型：不详难度：来源：

Scientists think that there has been life on Earth for   小题1: (百万) of years. However, we haven’t found life on other   小题2:  (行星) yet. The earth, the moon, and the sun are a small part of our galaxy. Scientists have   小题3:  ( 发现) many other galaxies in the universe. And there are many books about the universe. I’ve just finished   小题4: (看) a great book at school. It is a book about the solar system. It is so good that I’ve 小题5:   (已经) asked the library to keep the next book for 小题6: (我). In the book, it says that astronauts have    小题7:  (去) to Mars and even to Jupiter. I’ve never read that before. I’ve  小题8: (写信) to NASA to ask them for  小题9: （更多）information about astronauts and space. I hope they will write    小题10:  (回) soon.

答案

小题1:millions
小题2:planets
小题3:discovered/found
小题4:reading
小题5:already
小题6:me
小题7:been
小题8:written
小题9:more
小题10:back

解析

试题分析：
小题1:此题考查不确切数量的表达方式，在hundred，million等词的复数后面加“s”表示不确切数量，故选millions.
小题2:此题考查名词的复数形式，planet是可数名词，其他的行星就用other planets.
小题3:此题考查动词的过去分词，因发现在英文中用两个单词来表示，find和discover，它们的过去分词形式是found和discovered。
小题4:此题考查固定短语finish doing sth表示做完某事，故选reading。
小题5:此题考查副词，在肯定句中，表示已经的副词用already。
小题6:此题考查人称代词，因前面有介词for，故用宾格me。
小题7:此题考查固定短语have been to 表示曾经去过某地，故用been。
小题8:此题考查固定结构write to sb表示给某人写信，因用完成时，故用written。
小题9:此题考查形容词的比较级more。表示更多的。
小题10:此题考查固定结构write back表示回信的意思。
点评：此文重点介绍了一些天文知识。注意要把握好上下文的内容的内在联系，根据汉语的提示的内容，使文章内容意思连贯一致。一定要把握好单词的正确形式。