_________ WAS THE OLDEST HUMAN EVER FLY INTO SPACE

20.

Yang Liwei: _________ was the oldest human ever fly into space?

John Glenn: It’s me!

A. Where

B. What

C. How long

D. Who

III. READING (2.5 p)

Part 1. Read the text and choose the answer that best fits in each gap

Scientists are now looking (21) _________cheaper way to use solar energy to heat air and water.

Many buildings are using solar energy to heat

(22) _________ water now. Solar unit on the roofs of

buildings collect the energy and use it to heat water. (23)_________ these units are still very expensive,

more and more people are buying solar hot water heaters. Universities and colleges give solar energy

courses where students learn (24) _________ their own solar collectors. There are also (25) _________

books that explain the construction of solar collectors. In the future, there will be more and more solar

collectors, especially in the sunny desert areas of the world.