新一代大学英视听说教程1 U2 PPT 课件

Listening and
Speaking
Genetically modified food Listening and understanding
Arguments for GM food
Arguments against GM food
• GM food is probably 1) _s_a_fe__r_ • GM food is unnatural and therefore
Unit 2
Food and Health
01 Warm-up 02 Listening and Speaking 03 Viewing and Speaking 04 Project
CONTENTS
Warm-up
Work in pairs on the following activities. Step 1 Read the food terms and the descriptions carefully.
over a decade, there is still extensive controversy about it. Work in two groups and hold an informal debate on the topic “Is GM food beneficial?”. You can base your argument on what you’ve heard from the conversation, your own experience and reasoning, and what you’ve learned from books, newspapers, or the Internet.
Warm-up
Reference answers
1 Main points: Healthy eating is not just about keeping a healthy weight – it affects one’s total state of well-being. Poor eating habits are linked to a large number of diseases such as heart disease, stroke and diabetes. My father, for example, always buys organic food even if it is more expensive. He tries to ensure a healthy and balanced diet for the family.

than non-GM food because there potentially risky.
are 2) _t_ig_h_t_e_r__co__n_t_ro_l_s_ for GM • We haven’t done enough research and
food.
GM food is responsible for the
it is eaten. It does not spend days or weeks to be transported
and is therefore generally fresher.
GM food 4 It is food that is produced from organisms that have had
processed food 2 It is food that is specially treated to change color and keep fresh,
etc.
local food 3 It is food that is grown within a reasonable distance from where
Warm-up
Listening and Speaking
Topic One
Genetically modified food
Genetically modified food
Listening and understanding
1 Listen to a conversation on GM food and decide whether the
specific changes introduced into their DNA using the methods
of genetic engineering.
whole food 5 It is food that is not processed or refined, or that is processed
loose. F 4 The man thinks that the woman is cautious about GM food. T 5 The woman does not like the fact that some food companies are
using her for their experiments on GM food. F 6 The woman finally agrees with the man.
and refined as little as possible, before being consumed. It is
food in its natural state.
Warm-up
Work in pairs on the following activities.
Step 2
List the foods that you ate for breakfast, lunch and supper yesterday. For each of them, decide whether it is genetically modified, local, whole, processed, or organic.
Then match the descriptions with the terms.
Warm-up
organic food 1 It is food that is grown or produced without synthetic (人造的)
pesticides or chemical fertilizers.
effect on the 7) _w__h_o_l_e_e_c_o__sy_s_t_e_m__.
Listening and
Speaking
Genetically modified food
Thinking and speaking
3 Although GM food has been on supermarket shelves for
statements are true or false. Write “T” for “true” and “F” for “false”.
T 1 The man is in favor of GM food but the woman is against it. F 2 The woman thinks that she needs to do more reading on GM food. F 3 The man thinks that controls on GM food in most countries are
2 Main points: To stay healthy, you will have to eat those vegetables and fruits which you might not like as much as junk food. You will have to get up early in the morning, exercise regularly, or take the stairs instead of the elevator. In other words, it takes some effort to be healthy.
Warm-up
Reference answers
Breakfast Lunch Supper
Muffin Banana
Milk Rice Scrambled eggs with tomatoes Sweet and sour pork Dumplings
Processed food Whole food Local food Organic food
the habitats of species and
• GM food causes no end of damage to
prevent them from becoming 4) some plants and animals. When a species
__e_x_t_i_n_c_t_.
dies out or mutates, it has a knock-on
Listening and
Speaking
Genetically modified food Thinking and speaking
Arguments for GM food
• There have been a great number of studies tracking the effects of GM food on animals. These studies indicate that GM food is safe to consume. • Farmers who grow GM crops use fewer environmentally damaging pesticides. • GM crops can have larger yields. The increased yields of GM crops are essential to feeding the world’s growing population. • GM food can withstand colder weather, droughts, and floods.