1. B 2. A 3. B 4. A 5. B
1.Building a house is no joking matter. You have to check carefully at every step.
2.His troops successfully checked the advance of the enemy whose original intention was to make a surprise attack.
3.Rachel Carson is famous for devoting all her life to the cause of environmental protection.
4.We teachers cannot be excused for our lack of concern for students’ health.
5.He said that he would rather die than be confined to ded all his life and isolated from the outside world.
6.A mass protest swept country and he was caught in a crossfire from both the right and the left.