What does the passage mainly discuss?

----- Nội dung dịch tự động từ ảnh -----
PASSAGE B
Orchids are unique in having the most highly developed of all blossoms, in which the usual male and female
reproductive organs are fused in a single structure called the column. The column is designed so that a single pollination will
fertilize hundreds of thousands, and in some cases millions, of seeds, so microscopic and light they are easily carried by the
breeze. Surrounding the column are three sepals and three petals, sometimes easily recognizable as such, often distorted
into gorgeous, weird, but always functional shapes. The most noticeable of the petals is called the labellum, or lip. It is often
dramatically marked as an unmistakable landing strip to attract the specific insect the orchid has chosen as its pollinator.
To lure their pollinators from afar, orchids use appropriately intriguing shapes, colors, and scents. At least 50 different
aromatic compounds have been analyzed in the orchid family, each blended to attract one, or at most a few, species of insects
or birds. Some orchids even change their scents to interest different insects at different times.
Once the right insect has been attracted, some orchids present all sorts of one-way obstacle courses to make sure it does
not leave until pollen has been accurately placed or removed. By such ingenious adaptations to specific pollinators, orchids have
avoided the hazards of rampant crossbreeding in the wild, assuring the survival of species as discrete identities. At the same
time they have made themselves irresistible to collectors.
11. What does the passage mainly discuss?
(A) Birds
B. Insects
12. The orchid is unique because of
(A) the habitat in which it lives
(C) the variety of products that can be made from it
13. The word "fused" in line 2 is closest in meaning to
(A) combined
(B) hidden
14. How many orchid seeds are typically pollinated at one time?
(A) 200
(C) 20,000
(C) The stem
(C) an airport runway
by which an orchid attracts insects?
(C) Color
(B) 2,000
15. Which of the following is a kind of petal?
(B) The sepal
(A) The column
16. The labellum (line 5) is most comparable to
(A) a microscope
(B) an obstacle course
17. Which of the following is NOT mentioned as a means
(A) Size
18. The word "their" in line 9 refers to
(B) Shape
(C) They are difficult to tell apart.
(D) They may change at different times.
20. The word "discrete" in line 12 is closest in meaning to
(A) complicated
(B) separate
(C) Flowers
(B) the structure of its blossom
(D) the length of its life
(A) They are effective only when an insect is near the blossom.
(B) Harmful insects are repelled by them.
(C) fertilized
(A) orchids
(B) birds
(C) insects
19. Which of the following statements about orchids scents does the passage support?
4. The job is not suitable for her, I think. (cut)
In
(C) inoffensive
By the time
2. After this one, there's a train leaving at 3 this afternoon. (next)
The
3. "You acted promptly in the emergency, Katie," said the officer.
The officer
(long)
8. The last thing you should do is to reveal the secret.
→ Under
(20 points)
PART FIVE: SENTENCE TRANSFORMATION
Rewrite each sentence in such a way that it means almost the same as the one printed before it. Use the word
in brackets without making any change to it.
1. Shortly before my sixteenth birthday, I will complete my intermediate course of English.
(celebrate)
5. Only this school offers high standards of teaching. (benefit)
→ It is
6. He has decided to teach in the remote area.
(committed)
→ He has
7. Just keep the book when you still need it.
→ You can
(give)
(bound)
9. Those students will certainly pass the examination.
→ Those
10.Someone stole all my money in my last trip to Vung Tau.
(D) Perfumes
(complement)
(D) produced
(D) 200,000
(D) The labellum
(D) a racetrack
(stolen)
(D) Perfume
(D) species
(D) functional