如图，∠ B=∠ D=90°， BC=DC，∠ 1=40°，则∠2=______度.

How many _____(hour) are there in a day?

__________，却话巴山夜雨时。(李商隐《夜雨寄北》 )

he( 物主代词 )__________

()1. Could you help me， please?A. OK.

()2. Thanks a lot.B. You're welcome.

()3. Let's put the books in the box.C. It's Monday.

()4. Can you carry it?D. No ，it's full.

()5. Who's on duty today?E. lam.

()6. Is it empty?F. No ，it's light.

()7. What day is it today?G. Certainly.

()8. Is that bag heavy?H. No. Li Lei isn't here. .

()9. Are we all here today?I. No ，thanks.

()10. Let me help you.J. Yes，I can.

over there( 汉语意思 )__________

country_________ (复数)

小明用实验估测薯条的热值，实验器材有：铁架台、温度计、烧杯(注有质量已知为m的煤油)、5角硬币(已知质量为m0)、质量不计的长薄木板、圆柱铅笔、塑料刻度尺、打火机、铁丝等器材.实验过程如下：

(1)组装器材.按照如图甲所示的装置安装实验器材.

(2)测定薯条的质量.因为没有天平，聪明的小明将圆柱铅笔放在桌子上，把圆柱铅笔作为支点位置并标记为O，5角硬币、薯条放在长薄木板的两

端，调整圆柱铅笔的位置使薄木板处于水平平衡状态，如图乙所示.用刻度尺分别量出L1、L2，则薯条的质量表达式为____.(用给定的量表示)

(3)测量煤油的初始温度t0

(4)将薯条点燃，放入燃烧皿中，用铁丝搅拌使其充分燃烧，待其充分燃烧完，煤油温度稳定时迅速记下煤油的末温t.若煤油的比热容为C煤油，则煤油吸收的热量表达式为____(用给定的量表示);薯条的热值表达式为____(用给定的量表示).薯条热值的测量值与真实值比____(选填“偏大”或“偏小”)

翻译下面的短语

1. 二瓶果汁___________

2. 到这来___________

3. 在树下___________

4. 双胞胎兄弟___________

5. how much___________

6. thanks a lot___________

7. look after___________

8. put on___________

9. 在天空中___________

10. 穿红衣服的女孩___________