Biologists think pufferfish, also known as blowfish, developed their famous “inflatability” because their slow, somewhat clumsy swimming style makes them vulnerable to predators. In lieu of escape, pufferfish use their highly elastic stomachs and the ability to quickly ingest huge amounts of water (and even air when necessary) to turn themselves into a virtually inedible ball several times their normal size. Some species also have spines on their skin to make them even less palatable.
A predator that manages to snag a puffer before it inflates won’t feel lucky for long. Almost all pufferfish contain tetrodotoxin, a substance that makes them foul tasting and often lethal to fish. To humans, tetrodotoxin is deadly, up to 1,200 times more poisonous than cyanide. There is enough toxin in one pufferfish to kill 30 adult humans, and there is no known antidote.
From: National Geographic
NB2
- Homework : I collected the compositions you had for homerwork. Let me remind you that if that particular day ,you can´t come to class, just send it to me through the "contact" section in my blog.
- Grammar:St.B.p. 17 simple past tense . Grammar Bank p. 128 with the rules and exercises and p. 155 with the list of irregular verbs. We read them out and checked their meanings. Then I gave you some photocopies about SIMPLE PAST and we did many of the exercises.
- Phonetics: The correct pronunciation of the simple past can only be reached by listening to songs or watching TV. We saw some basic rules on St.B.p. 17 and practised the most common regular verbs.
- Listening: St.B.p. 17 "A holiday where everything went wrong". you had to correct the wrong statements . Remember that you have the CDs ,so you can listen to these class activities whenever you fancy.
- Homework: Grammar, unit 10 "was/were". Workbook.p. 13,14 and do the remaining exercises of the photocopies about the simple past.
NI2
- Homework: Phrasal verb exercises .
- Grammar: St.B. p. 146: adverbs which are often confused, e.g. specially -especially. late-lately.
St.B.p. 15 .Writing: Joke where you had to insert adverbs to make it more vivid and interesting. Grammar, units 99,100 about adverbs. We saw the rules and the activities were left for homework.
- WritingSt.b. p. 156. How to make a composition more lively by using adverbs and intensifiers .
- Reading: ST.B.p. 16 with true-false statements and a vocabulary exercise.
- Listening: Meeting people using different registers , and a listening of a speech given by the director of Studies to students starting a summer course. Remember that you all have the CDs to listen to these activities .
- Reading: St.B.p. 17 Understanding signs and some very common daily life expressions you must learn so as not to seem rude.
- Homework: Revise and check. St.B.p 19. Grammar, unit 99,100.