Choose the correct answer.
If energy ......................inexpensive and unlimited, many things in the world would be different.
A.is
B.was
C.had been
D.would be

Choose the correct answer.
If we .......................serious about pollution, we ...................... more money on research.
A.had been/ spent
B.were/ had spent
C.were/ would spend
D.are/ will spend

Choose the correct answer.
Sea water is salty. If the oceans.................of fresh water, there ............. plenty of water to irrigate all of the deserts in the world.
A.consisted/ would be
B.consisted/ were
C.would consist/ could be
D.consist/ will be

Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.
A.record
B.shine
C.categorize
D.diversify

(37) .................
A.when
B.as
C.while
D.since

(39)...............
A.which
B.they
C.when
D.who

The best title for this passage is ……………
A.Sea Harvest
B.Sea Food
C.Man and the Sea
D.Technology for Exploiting the Sea

The sea serves the needs of man because ……………….
A.it provide man with food.
B.it supplies man with minerals.
C.it offers oil to man
D.all are correct

The words 'Oriental people' in paragraph 4 probably mean…………………..
A.the people in Asia
B.African people
C.European people
D.American people

xThe floor was covered in tiny pieces of paper.
A.unimportant
B.many
C.very large
D.extremely small