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TOEFL-style
Levels: B1–C2 · 4 lessons
Section 4
C2 · Lessons 40–434
40. Tidal flats as nurseries
5 sentences · Level C2 · 6 min
41. Reading time from the ground
5 sentences · Level C2 · 6 min
42. The faint young Sun puzzle
5 sentences · Level C2 · 6 min
43. Office hours about a thesis
5 sentences · Level C2 · 6 min