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我们已经学习了许多表示职业的英语单词，例如teacher(教师)，golfer(高尔夫球手)，programmer(电脑程序设计员)，engineer(工程师)，doctor(医生)，actor(演员)，还有pianist(钢琴手)，violinist(小提琴手)，journalist(新闻记者)等。我们可以发现这些表示职业的英语单词，含有-er，-or，或-ist词缀。学习英语单词词缀同样可以帮助我们记忆单词。你能猜出下面英语单词的意思吗？
dancer ________, diner ________, receiver ________, inventor ________, specialist ________.
查看习题详情和答案>>完成句子。
1. It’s not just because they ____________（不能理解它是什么意思）.
2. F 2 F ____________（表示面对面）.
3. Homophone often use letters and numbers that ____________（听起来像单词或单词的一部分）.
4. I don’t think twelve-year-olds should be allowed to ____________ （穿耳洞）.
5. I think teenagers should be allowed to ____________ （与朋友们外出）.
6. If we can’t wear our own clothes, we should be allowed to ____________（设计自己的校服）.
7. I get nervous before big parties and then I ____________（出皮疹）.
8. It isn’t good to borrow your friends’ books ____________（未经允许）.
9. What do you think I should tell ____________（其余的学生）.
10. My life ____________ （有了很大的改变）in the last few years.
查看习题详情和答案>>
(1)造血干细胞转变为a、b、c等细胞的过程被称为_________。
(2)③过程是在X的刺激和a细胞等的参与下共同完成的。与③过程相比，④过程的应答特点是______。
(3)⑤过程的产物Y的化学本质是___ ___，参与其合成并分泌的膜性细胞器 、高尔基体及线粒体。
(4)若X是禽流感病毒，则患者体内消灭X必须依靠a增殖分化的淋巴细胞去裂解__ _ ___。如果X是HIV，则由于图中___ ___细胞的大量死亡，导致患者几乎丧失一切免疫功能而死亡。 查看习题详情和答案>>
完成句子。
1. It’s not just because they ____________（不能理解它是什么意思）.
2. F 2 F ____________（表示面对面）.
3. Homophone often use letters and numbers that ____________（听起来像单词或单词的一部分）.
4. I don’t think twelve-year-olds should be allowed to ____________ （穿耳洞）.
5. I think teenagers should be allowed to ____________ （与朋友们外出）.
6. If we can’t wear our own clothes, we should be allowed to ____________（设计自己的校服）.
7. I get nervous before big parties and then I ____________（出皮疹）.
8. It isn’t good to borrow your friends’ books ____________（未经允许）.
9. What do you think I should tell ____________（其余的学生）.
10. My life ____________ （有了很大的改变）in the last few years.
1. It’s not just because they ____________（不能理解它是什么意思）.
2. F 2 F ____________（表示面对面）.
3. Homophone often use letters and numbers that ____________（听起来像单词或单词的一部分）.
4. I don’t think twelve-year-olds should be allowed to ____________ （穿耳洞）.
5. I think teenagers should be allowed to ____________ （与朋友们外出）.
6. If we can’t wear our own clothes, we should be allowed to ____________（设计自己的校服）.
7. I get nervous before big parties and then I ____________（出皮疹）.
8. It isn’t good to borrow your friends’ books ____________（未经允许）.
9. What do you think I should tell ____________（其余的学生）.
10. My life ____________ （有了很大的改变）in the last few years. 查看习题详情和答案>>