4000 Bài tập tiếng Anh chọn lọc theo dạng & phân loại theo mức độ (có lời giải chi tiết)

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Nơi bồi dưỡng kiến thức Toán - Lý - Hóa cho học sinh cấp 2+3 /
Diễn Đàn Toán - Lý - Hóa Quy Nhơn 1000B Trần Hưng Đạo Tp.Quy Nhơn Tỉnh Bình Định
A. parents B. teenagers C. business people D. People who work in institutions
Question 24: In chat rooms, _____.
A. people communicate face-to-face
B. people may give a false impression
C. you know who you are talking to
D. parents and children communicate with each other
Question 25: The expression pass themselves off as in paragraph 2 means ____.
A. look like B. participate C. pretend to be D. contribute
Question 26: What can we understand about the face-to-face meetings mentioned in paragraph 2?
A. All people in chat groups have them.
B. They may turn out to be harmful to children.
C. They help to communicate better.
D. They give children false information.
Question 27: The racist and political extreme views mentioned in paragraph 3 are example of _____.
A. what you see on some Internet sites
B. what children think they use the Internet
C. parental intervention
D. the huge amount of information available.
Question 28: We can understand from the passage that _____.
A. there is not enough supervision on the Internet B. politicians control the Internet
C. parents should not intervene D. the Internet leads to criminal activity
Question 29: It seems that the main point the author is trying to make about the Internet is that it _____.
A. can be dangerous B. provides unlimited access to information
C. is beneficial D. should only be used by adults
Exercise 5. Read the following passage and mark the letter A, B, C or D on your answer sheet to
indicate the correct answer to each of the following questions.
Plants are subject to attack and infection by a remarkable variety of symbiotic species and have
evolved a diverse array of mechanisms designed to frustrate the potential colonists. These can be divided
into preformed or passive defense mechanisms and inducible or active systems. Passive plant defense
comprises physical and chemical barriers that prevent entry of pathogens, such as bacteria, or render
tissues unpalatable or toxic to the invader. The external surfaces of plants, in addition to being covered by
an epidermis and a waxy cuticle, often carry spiky hairs known as trichomes, which either prevent
feeding by insects or may even puncture and kill insect larvae. Other trichomes are sticky and glandular
and effectively trap and immobilize insects. If the physical barriers of the plant are breached, then
preformed chemicals may inhibit or kill the intruder, and plant tissues contain a diverse array of toxic or
potentially toxic substances, such as resins, tannins, glycosides, and alkaloids, many of which are highly
effective deterrents to insects that feed on plants. The success of the Colorado beetle in infesting potatoes,
for example, seems to be correlated with its high tolerance to alkaloids that normally repel potential pests.
Other possible chemical defenses, while not directly toxic to the parasite, may inhibit some essential step
in the establishment of a parasitic relationship. For example, glycoproteins in plant cell walls may
inactivate enzymes that degrade cell walls. These enzymes are often produced by bacteria and fungi.
DIỄN ĐÀN TOÁN - LÝ - HÓA 1000B TRẦN HƯNG ĐẠO TP.QUY NHƠN
Active plant defense mechanisms are comparable to the immune system of vertebrate animals,
although the cellular and molecular bases are fundamentally different. Both, however, are triggered in
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