Unit 2   Crossing limits

task one: listen for the first time and fill in the chart
t: in the tape you are going to hear the differences of communication and transport used in the past and at present. listen to the tape and fill the chart of exercise 2 on page 11.
students listen and do the exercise.
task two: do shorthand
t: listen to the tape for the second time and fill in the chart below. before that you had better read the questions of exercise 3 carefully.
students listen to the tape and do shorthand.
risks in the past 
solutions for modern explorers having no map 
similarities between the past expeditions and trips to mars 
step v post-listening
task one: discussion
t: exploration means advancement. it was armstrong’s first step on the moon that enables people to know what the real moon is like. meanwhile, explorations are not without dangers and challenges. recall your early experiences or choose one topic from the teacher’s list to discuss what dangers or difficulties you may have in the course of exploration. work in groups of four and list all the possible dangers or difficulties. after that, please find out possible solutions to the problems.
teacher’s list:

situations
 exploring an uninhabited (無人居住的) island
 going through a cave
 discover a special plant
students discuss in groups and try to find out possible solutions.
s: take exploring an uninhabited island as an example, we may meet the following dangers and difficulties and we have found out possible solutions to them, as is shown in the below.
dangers and difficulties solutions
we may meet with big waves on the voyage  prepare a boat strong enough and listen to weather forecast before hand
we may get lost in the island take a compass and make marks along the way
we may find it difficult to make meals prepare enough food and fresh water and take some matches
we may be attacked by the snakes prepare a safe sleeping bag and some medicines

step ⅵ listening practice
task one: choose the best answers
t: listen to the tape for the first time and do exercise 2 on page 153.
students go through the requirement before listening and listen to get the answers.
task two: listen and answer questions
t: listen to the tape for the second time and do exercise 3 on page 153.
students go through the requirement before listening and find answers to the questions.

step vii homework
task one: use the following words to make short phrases (eg: evaluate—evaluate the situation)
words and expressions: evaluate, various, make a decision, in the name of, solve the energy problem, be rich in, take possession of, damage, disturb, available