答：①尽可能地不使用一次性用品；②延长物品的使用寿命；③包装盒纸在垃圾中比例很大，购物时减少对它们的使用。
15、经过有效处理的废水，可以排放到湖泊、河流和海洋中，也可以渗入地下。
4、咀嚼馒头的外皮也可以感觉到甜味吗？为什么？
11、在淡水资源短缺的情况下，水污染更给人类和其他生物造成了威胁。绝大多数的水污染都是由人类的活动引起的。
21、血液中的细胞好像运输兵，负责运输吸入的氧气和产生的二氧化碳。
1、世界是由物质构成的。我们身边的书、橡皮、电灯、大树、动物、植物包括我们自己都是由物质构成的。
14、在显微镜下观察物体有一定的要求。物体必须制成玻片标本，才能在显微镜下观察它的精细结构。
17、近年来，我国积极推广“无车日”活动，以节约能源和保护环境。科学家也正在研制太阳能汽车和燃料电池汽车，减少对空气的污染。
7、将铁钉的一部分浸入硫酸铜溶液中，有什么现象？过一会儿，取出铁钉，我们又观察到了什么现象？（p36）
18、建立自然保护区是保护生物多样性的有效方法，我国的九寨沟、长白山、四川卧龙等地都建立了自然保护区，自然保护区为物种的生存、繁衍提供了良好的场所。day10 name:
一般疑问句练习题。
1. his father is an english teacher.
2. these cats are crying.
3. they can swim.
4. i like to read english.
5. i go to school on foot.
6. he likes english.
7. his father goes to work by bus.
8. he is crying under the tree.
9. his birthday is on the twentieth of november.
10. mrs. li and kitty are in a big shop.
12. the boy under the tree is hungry.
13. he goes to school every day.
15. i want to h**e a model car.
16. she wants a cup of coffee.
17. mrs. li and kitty watch tv at night.
18. i do my homework after school.
特殊疑问句练习题（一）
疑问词如下：
什么 what谁 who
谁的 whose在** where
哪一个which为什么 why
星期几what day几点 what time
怎样 how怎么样how about
多少how many+名词复数 ⑿ 多少岁 how old
多少钱 how much什么颜色 what colour
一、就画线部分提问。
is my father.
are under the tree.
often watch tv after dinner.(晚饭后) 提示：饭后强调的是时间问题。
4. lily swims in the swimming pool.(游泳池)
often brush my teeth in the evening.
5. alan likes to play with bill.
7. joe's father plays badminton(羽毛球) every weekend.
8. the supermarket is near the school.
9. the computer is on the table.
10. the flowers are in the flower pot(花盆).
11. my grandpa took us to the zoo.
12. themonkey sleeps at night.
二、句型转换。
1、yang ling gets up at half past six.
yang ling __up?
2、my brother often does his homework at the weekends.
your brother often __his homework?
3、nancy is from the uk.
nancy from?
4、the grape is in my mouth.
the grapes?
5、they like doing exercise.
they like doing?
6、the girl in red is playing the piano now.
girl is playing the piano now?
7、this jacket is wang bing’s.
this jacket?
8、 there is one butterfly near the flowers.
near the flowers?
9、 miss zhang and i usually go to school by bike.
miss zhang and i usually go to school?
10、the girl has got a bad cold.
has got a bad cold?
11、the students in my school like english and art.
students like english and art?
12、it’s tuesday today.
it today?
13、they usually watch tv in the evening.
they usually __in the evening?
14、the t-shirt is eighty yuan.
the t-shirt?
15、i usually make clothes in the evening.
you usually __in the evening?
16、they live in the same town.
they live?
17、 my parents usually read books after supper.
your parents usually __after supper?
18、 wang bing surfs the internet on saturday afternoon.
wang bing __on saturday afternoon?
19、 he likes collecting animal stamps.
he like __
20、 she usually reads science magazines on sunday morning.
she usually __on sunday morning?
21、 he has seven lessons every day.
lessons __he __every day?
二、选择正确的单词填空(who, where, when)
1. _is that pretty girl? she is my sister.
2.__are jack and tom? they are behind you.
3.__do you go to school? i go to school from monday to friday.
4.__has a beautiful flower? john has a beautiful flower.
5.__are they? they are my parents.
6.__is my mother? she is in the living room.
7.__are you going? we are going to the bakery(面包坊).
8.__do jim and wendy play ball? they play ball in the afternoon.
9.__does he jog? he jogs in the park.
10.__are you from? i'm from changchun city.
特殊疑问句练习（二）
一．用what time, what color, what day, what填空。
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