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假如你是魏青，请你用英语给你的笔友于林写一封信，向他说明你以前在英语学习中遇到的困难，（听不懂老师的英语，课堂上不敢说英语，记不住单词，作句子不完整等等），经过改进学习方法（上课做语法笔记，向老师求助，每天听英语录音，大声读练习发单，看英语电视节目等等），现在英语有了很大的提高。
Dear YuLin,
___________How’s it going?____
查看习题详情和答案>>
⑴ 从苏云金芽孢杆菌中切割抗虫基因所用的工具是______________，此工具主要存在于__________中，其特点是_________________________________________________。
⑵ 苏云金芽孢秆菌一个DNA分子上有许多基因，获得抗虫基因常采用的方法是“鸟枪法”。具体做法是：用______________将苏云金芽孢杆菌的__________切成许多片段，然后将这些片段____________________________，再通过_______________转入不同的受体细胞，让它们在各个受体细胞中大量______________，从中找出含有目的基因的细胞，再用一定的方法把__________________分离出来。
⑶ 进行基因操作一般要经过的四个步骤依次是________________________________、____________________________________、___________________________________、____________________________________。 查看习题详情和答案>>
假如你是魏青，请你用英语给你的笔友于林写一封信，向他说明你以前在英语学习中遇到的困难，（听不懂老师的英语，课堂上不敢说英语，记不住单词，作句子不完整等等），经过改进学习方法（上课做语法笔记，向老师求助，每天听英语录音，大声读练习发单，看英语电视节目等等），现在英语有了很大的提高。
Dear YuLin,
___________How’s it going?____
2. How is the weather in Beijing? ________ ________ ________.
3.What does your friend look like? He is really tall, and he has ________,________ ________.
4. How often do you go to the movies? I go to the movies _______ _______ _______ _______.
5.You don't look well. You should ________ ________ ________ ________.
6.How long does it take you from home to school? It takes about ________ ________.
7.Where did you go on vacation, Tom? I ________ ________ ________ ________ ________.
（一）听句子，找出与句子内容相符的最佳选项，每个句子读两遍。
1.A.milk B.water C.jujce
2.A.America B.Canada C.Australia
3.A.nice B.dear C.cheap
4.A.read B.speak C.repeat
5.A.peace B.love C.building
（二）听对话和问题，选择符合每个问题答案的图画，每段对话和问题读两遍。
6.
7.
8.
9.
10.
（三）听对话，然后根据对话内容选择每个问题的正确答案，每段对话和问题读两遍。
11.What time did the woman get to the airport to meet her father?
A.1∶00 B.12∶00 C.2∶20
12.What′s her father′s flight number?
A.BA506. B.VA407. C.VA408.
13.What time will the flight arrive?
A.3∶30 pm. B.2∶20 pm. C.2∶00 pm.
14.Why is the flight late?
A. Because the airport is too busy.
B. Because the weather in New York is had.
C. Because something is wrong with the plane.
15.How long did the woman wait in the airport that day?
A. One hour.
B. Over three hours.
C. Two hours and twenty minutes.
（四）请听一则寻人启示，听录音两遍后，根据内容完成登记卡。
| Registe Card Mrs Smith looks for a person at 10∶00am. Name:Betty Smith Sex: 1 (male/female)Age: 2 Height: 3 m Hair: 4 , 5 Clothes:a 6 blouse, 7 jeans Room: 8 on the 9 floor Telephone number: 10 Wal Mart S.C. |