Câu hỏi:
28/03/2020 287Read the passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions.
The forest from which Man takes his timber is the tallest and most impressive plant community on Earth. In terms of Man’s brief life, it appears permanent and unchanging, save for the season growth and fall of the leaves, but to the forester, it represents the climax of a long succession of events.
No wooded landscape we see today has been forest for all time. Plants have minimum requirements of temperature and moisture and, in ages past, virtually every part of Earth’s surface has, at some time, been either too dry or too cool for plants to survive.
However, as soon as climatic conditions change in favor of plant life, a fascinating sequence of changes, called a primary succession, occurs first to colonize the barren land and the lichen surviving on bare rock. Slowly, the acids produced by these organisms crack the rock’s surface, plants debris accumulate and mosses establish shallow root-holes. Ferns may allow and, with short grasses and shrubs, gradually form a covering of plant life. Roots broke even deeper into the developing soil and eventually large shrubs give way to the first trees. These grow rapidly, cutting off sunlight from the smaller plants, and soon establish complete domination - closing their ranks and forming a climax community which may endure for thousands of years. Yet even this community is not everlasting. Fire may destroy it outright and settlers may cut it down to gain land for pasture or cultivations. If the land is then abandoned, a secondary succession will take over, developing much faster on the more hospitable soil. Shrubs and trees are among the early invaders, their seeds carried by the wind, by birds and lodged in the coat of mammals.
For as long as it stands and strives, the forest is a vast machine storing energy and the many elements essential for life.
What has sometimes caused plants to die out in the past?
Đáp án chính xác
Câu hỏi trong đề:
Tổng hợp Đề thi thử THPT Quốc Gia môn Tiếng anh năm 2020 !!
Sách mới 2k7: Tổng ôn Toán, Lí, Hóa, Văn, Sử, Địa…. kỳ thi tốt nghiệp THPT Quốc gia 2025, đánh giá năng lực (chỉ từ 110k).
Quảng cáo
Trả lời:
Giải bởi Vietjack
Đáp án là A.
Dựa vào ý: Plants have minimum requirements of temperature and moisture and, in ages past, virtually every part of Earth’s surface has, at some time, been either too dry or too cool for plants to survive.
Nhà sách VIETJACK:
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 1:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
My friend often shows her _____ whenever I have troubles.
Xem đáp án »
10/01/2022
37,266
Câu 2:
Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.
He drives me to the edge because he never stops talking.
Xem đáp án »
28/03/2020
33,820
Câu 3:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
My daughter is learning to play x violin at x school.
Xem đáp án »
28/03/2020
24,466
Câu 4:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
I was brought x in the countryside by my aunt after my parents had pass x .
Xem đáp án »
28/03/2020
23,209
Câu 5:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Elevators in tall buildings make the top floors accessible x everybody.
Xem đáp án »
06/04/2020
20,211
Câu 6:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Near the White House is another famous landmark x the Washington Monument.
Xem đáp án »
28/03/2020
19,596
Câu 7:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
One's fingerprints are x other person.
Xem đáp án »
28/03/2020
17,739
về câu hỏi!