Lesson 17-2 A man-made disease It effectively spread the disease all over the continent...
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Lesson 17-2 A man-made disease It effectively spread the disease all over the continent...
Lesson 17-1 A man-made disease In the early days of the settlement of Australia, enterp...
Lesson 13-1 The search for oil The deepest holes of all made for oil, and they go down ...
Lesson 13-2 The search for oil The geologist needs to know what rocks the drill has rea...
Lesson 4-1 Seeing hands Several cases have been reported in Russia recently of people w...
Lesson 12-1 Banks and their customers When anyone opens a current account at a bank, he...
Lesson 11-2 How to grow old An individual human existence should be like a river -- sma...
Lesson 11-1 How to grow old ˈlɛsn 11-1 haʊ tuː grəʊ əʊld Some old people are oppressed ...
Lesson 9-2 Royal espionage Alfred stayed in the camp a week before he returned to Athel...
Lesson 9-1 Royal espionage Alfred the Great acted as his own spy, visiting Danish camps...
Lesson 7-1 Bats Not all sounds made by animals serve as language, and we have only to t...
Lesson 7-2 Bats Every solid object will reflect a sound, varying according to the size ...
Lesson 6-2 The sporting spirit体育的精神 On the village green, where you pick up sides and n...
Lesson 6-1 The sporting spirit体育的精神 I am always amazed when I hear people saying that s...
Lesson 3-2 Matterhorn man马特霍恩山区人 It is hard for us to realize nowadays how difficult it...
L60-3: Too early and too late An even harder situation is to be on the platform in good...
Lesson 3-1 Matterhorn man马特霍恩山区人 Modern alpinists try to climb mountains by a route whi...
Lesson 2-2 Spare that spider不要伤害蜘蛛 ˈlɛsn 2-2 speə ðæt ˈspaɪdə How many spiders are enga...
L60-4: Too early and too late The girl asked to see a timetable, feeling sure that her ...
Lesson 2-1 Spare that spider不要伤害蜘蛛 Why, you may wonder, should spiders be our friends? ...