1 c
2 c
3 b
4 a
5 a
6 c
7 a
8 c
9 b
10 a
Archimedes. Why in the first place was the ancient Greek scientist? First of all, because he is one of the greatest mathematicians of all times, close he came to the calculation of the number of "PI". Today all students and students of the daily study and enjoy the discoveries of the Greek. Also Archimedes was famous for the invention of many useful machines. Among these are the siege guns, and mirrors, поджигающие sails on the Roman ships by focusing sunlight. Archimedes made the first theorist of mechanics. For example, he presented the complete theory of the lever, applying it in practice. Also, scientists have developed a Archimedes screw (screw), with the help of which вычерпывается water and the present day. The primacy of the inventor of merit - all of it was opened more than two thousand years ago, when there were no computers, no technology available today, the inventors. Archimedes, perhaps, he studied in the libraries of Alexandria, but most of his knowledge was acquired independently.
1.They haven't released the young eagles into the wild yet. (слово-маркер yet указывает на необходимость употребления Present Perfect)
2.The female eagle was tired. She had been hunting for five hours. (есть маркер for + период времени, значит, нужен Perfect Continuous. А поскольку первое предложение в Past Simple, то и во втором тоже пишем Past)
3.James had taken pictures of many species of eagle by the end of his trip. (сочетание с предлогом by указывает момент, к которому завершилось действие - это маркер Past Perfect)
4.Have the eagles been building their nest for the last two weeks? (Здесь тоже акцент на длительности действия, начавшегося в и длящегося до момента речи, так что используем Present Perfect Continuous)
1c 2c 3b 4a 5a 6c 7a 8c 9b 10 a
Объяснение: