1.  

What can be inferred about the man?

2.

What does the woman mean?

3.

What does the woman suggest the man do?

4.

What does the man mean?

5.

What does the man imply?

6. Simple photographic lenses cannot ____ sharp, undistorted images over a wide field.

7. Of all the factors affecting agricultural yields, weather is the one _______ the most. 

8. Twenty to thirty year after a nature forest is cleared away, a nearly impenetrable thicket of the trees and shrubs develops

9. The first national park in world, Yellowstone National Park, was established in 1872

10. Because it does not have a blood supply, the cornea takes their oxygen directly from the air

11. (Line 1) Virtually every epoch of human civilization includes references to flight. From
ancient winged deities to a score of myths, themes of flight occur repeatedly.
There were undoubtedly sporadic attempts to achieve human flight, probably in
imitation of birds. The first credible mention of such efforts appeared in a book 
(Line 5) written in 1250, which referred to an ornithopter, a winged machine strapped
to a person’s arms. Based on the flapping motion of a bird’s wings, an ornithopter
would require a good deal of muscular energy from the arms of its human
operator. Since this was not a practical source of mechanical power, it could not fly.
With the age-old problem of suitable power sources impeding early 
(Line 10) experiments, the first person to leave the surface of the Earth did so in
the eighteenth century in a balloon. The first balloons were buoyed into and kept up
in the air with air itself – hot air. The Montgolfier brothers had observed that warm
air rose, and reasoned that if they could capture it in a lightweight bag, the bag
would rise along with anything attached to it. They experimented with several
(Line 15) small linen bags lined with paper to help retain the hot air. The first free flight in a
balloon was made in 1783, a 25-minute journey totaling 8 kilometers.
Practical heavier-than-air flight evolved from fixed-wing aircraft in the form of
gliders, which are motorless aircraft that are launched from high places. Gliding
itself dated from the year 1000, when a Benedictine monk reportedly launched 
(Line 20) himself from a tower and flew more than 400 meters. However, structural
and stability problems seemed to frustrate gliding enthusiasts until the early
nineteenth century. With the addition of propellers and engines in the early
twentieth century, airplanes at last became a reality

11. What does the passage mainly discuss?

12. The word “sporadic” in line 3 is closest in meaning to

13. According to the passage, what was the problem with the ornithopter?

14. The word “it” in line 8 refers to

15. What can be inferred about gliders that were made before the nineteenth century?