答：①利用微生物的作用，我们可以生产酒、醋、酸奶、馒头和面包等食品。②土壤中的微生物可以分解动植物的尸体，使它们变成植物需要的营养素。③在工业生产和医药卫生中也都离不开微生物。
一、填空：7、硫酸铜溶液与铁钉的反应属于化学反应。硫酸铜溶液的颜色是蓝色，将铁钉浸入硫酸铜溶液中，我们发现铁钉变红了。
3、苍蝇落在竖直光滑的玻璃上，不但不滑落，而且还能在上面爬行，这和它脚的构造有关。蟋蟀的耳朵在足的内侧。蝴蝶的翅膀上布满彩色小鳞片，其实是扁平的细毛。
17、大熊座的明显标志就是我们熟悉的由七颗亮星组成的北斗七星，一、填空：
11、显微镜的发明，是人类认识世界的一大飞跃，把有类带入了一个崭新的微观世界。为了看到更小的物体，人们又研制出了电子显微镜和扫描隧道显微镜。电子显微镜可把物体放大到200万倍。
对划线部分提问/句型转换专项训练习题。
练习一： is a japanese car. (改为否定句) thisa japanese car.
s my cup. (改为一般疑问句that __cup?
is a nice jeep. (对划线部分提问it?
hua is in row three. (同上is wei hua in?
that a computer? (作否定回答) no
6. it's a pear. (改为否定句a pear.
7. you can sit down. (改为一般疑问句sit down?
8. i am in grade 2.(对划线部分提问you in?
9. is that a cake?(作否定回答。
10. is, what, three, one, and(连词成句。
11. i think it is a bird. (改为否定句) i __think it __a bird.
12. han mei isn't in today. (改为同义句) han mei isn'ttoday.
13. li lei is twelve. (对划线部分提问is li lei?
14. her name is li lan. (改为一般疑问句name li lan?
15. the cat is here. (对划线部分提问the cat?
s a pencil-box. (改为复数句are
17. that's ok. (改为同义句that's
18. these are chinese books. (改为否定句) thesechinese books.
19. they are children. (改为单数句) hea
20. those are hills. (对划线部分提问。
21-25 同义句)
21. that isn't a new coatthat iscoat.
22. lily is in row two. lucy is in row two, too.
lily and lucy are inrow.
23. tom and billy are twinstom is billy's
24. my bike is heremy bike __not __
25. every student is at school today. the studentsat school today.
26. jim green is english. (用american 构成选择疑问句)
27. they are boxes. (改为否定句。
28. my brother can spell his name. (改为一般疑问句)
29. we go to school at seven. (用emma作主语)
30. my phone number is 6835702. (对划线部分提问)
1. is not 2. is, your 3. what is 4. what row 5. it isn't
6. it isn't 7. can i 8. what grade are 9. no, it isn't 10. what's one and three
11. don't, is 12. at home 13. how old 14. is her 15. where is
16. they, pencil-boxes 17. all right 18. are not 19. is, child 20. what are those
21. an old 22. the same 23. twin brother 24. is, there 25. are all
26. is jim green english or american
27. they aren't boxes
28. can your brother spell his name
29. emma goes to school at seven
30. what's your phone number
练习二：四类专项练习。
一、将下列句子改为复数形式：
is a knife in the boxtherein the box.
's a woman doctorthey're
teacher often tells us a storyour __often __us __
sheep is over theretheover there.
pass me a piece of breadplease pass me some __of __
二、下列句子改为否定句：
does some reading every day. hereading every day.
h**e to wash the dishesiwash the dishes.
him the newshim the news.
has brothers and sistersshe has___brothers __sisters.
think she is rightisheright.
三、下列句子改为一般疑问句：
is some fruit juice in the glassfruit juice in the glass?
has to stay herehe __to stay there?
3. we do eye exercises every dayyou __eye exercises every day?
4. she has something to eatsheto eat?
am good at singing and dancingyou good at singing __dancing?
小升初英语句型转换训练习题
3 你知道月食的形成过程吗？答 可以节约能源 减少对环境的污染 降低成本。7 对于生活中的一些废弃物，我们可以从垃圾中 它们并重新加工利用。这样做不但能够减少垃圾的数量，而且能够节省大量的自然资源。预计未来20年，全球人均供水量还将减少1 3。16 在北部天空的小熊座上有著名的北极星，可以借助大熊座...
小升初英语句型转换练习题
柏林学校句型转换 1 i ll go and join them.改否定 i go join them.is a bus 改为一般疑问句。对划线部分提问 athomelipingtoday?li is our english teacher.对划线部分提问 mr li is englishteach...
小升初英语句型转换训练
小升初英语句型转换专项训练。学而思精品资料博采众长精心编辑的10套题目 适合具有较好的小学英语基础，但在句型转换还未熟练掌握的小朋友。练习一 熟悉一下。is a japanese car.改为否定句 thisa japanese car.s my cup.改为一般疑问句that cup?is a n...