问题
填空题
动脉和静脉是 的器官。它们的区别在于它们输送血液的 不同，动脉是将血液 ，静脉是将血液 。
答案
输送血液 方向 送离心脏 送回心脏
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动脉和静脉是 的器官。它们的区别在于它们输送血液的 不同，动脉是将血液 ，静脉是将血液 。
输送血液 方向 送离心脏 送回心脏
| 短文改错。 | |
| High school in the United States is usually dividing into Two periodsthe first two and three years is called "junior high school" and other is "senior high school". In China, children enjoy free education of nine year, but in the United States, the students enjoy free education until they are of eighteen years old. American children have little difficulty go to senior high school. American high school students could take part in a lot of activity outside of the classroom. The school organize the activities such as joining a music group or a sports team. Certainly, just like we students in China. | 1._________ 2._________ 3._________ 4._________ 5._________ 6._________ 7._________ 8._________ 9._________ 10.________ |