6.　　　 At the airports, machines s___________ all the luggage for bombs and guns.

5.　　　 The little boy climbed the tree and sat on a b_____________.

4.　　　 Don’t be so c___________--it’s got nothing to do with you.

3.　　　 The school is w__________ 5 minutes’ walk of my house; I go to it on foot everyday.

2.　　　 His disappointment was o___________ to everyone. Didn’t you see it?

1.　　　 The most recent survey of rare birds was u___________ in 1991.

1. Usage of words

6. The basic steps of the scientific method do NOT necessarily include ________.

A.　　 getting a model with which to test the theory

B.　　　 building a theory about how things happens

C.　　　 observing something with care and attention

D.　　 trying to test the theory in a practical way

5. According to Hawking, many people think that_________________.

A.　　 science is often misunderstood

B.　　　 science is changing all the time

C.　　　 some science facts can be wrong

D.　　 true science facts always stay unchanged

4. A Brief History of Time became a best-seller because ______________.

A.　　 it’s about the Big Bang and black holes

B.　　　 it explains what it means to be a scientist and how science works

C.　　　 it includes answers to many questions about the universe

D.　　 it was written in a way ordinary people could understand