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loveapink2011
2 năm trước
môt hồ nước bị cho là ô nhiễm nguồn nước gây nên sự giảm sút các loài sinh vật trong đó.. Người ta cho tiến hành khác phục ô nhiễm . Khi mức ô nhiễm nguồn nước giảm đi mức đa dang về loài xảy ra theo hướng nào ? A Tăng theo thời gian B dao động có chu kì theo thời gian C Giảm theo thời gian D Không tăng không giảm theo thời gian
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Các câu hỏi liên quan

X- Read the following passage and choose the best answer. (0.2x 5=1.0pts) Nhan and Huong want to know their friends’ favorite free time activities, so they are asking their friends about what they like to do in their free time. Many of their friends say that usually eat and drink as well as chat with their friends. They like to talk about many things around them: their teachers, their friends, their families as well as their favorite musicians, singers, soccer players and movie stars. There are some popular activities after lessons at their school such as: skipping rope, reading books and playing sports. At home, many of their friends say they like to watch TV, listen to music or play computer games. They rarely go to the movies. Some of the girls like to go shopping. Very few of their friends like to do English exercises on the Internet. Many of their friends don’t take part in art, music club. 1. What do many of Nhan and Huong’s friends usually do in free time? A. eat, drink and chat. B. go shopping C. go to the movie. D. do English exercises on the Internet. 2. What do their friends like to talk about? A. their teachers, friends and families B. their favorite musician and singers C. their favorite soccer players and movie stars D. many things around them 3. Which of the following activities is NOT popular with their friends at school? A. Skipping rope B. Take part in art, music club C. Reading books D. Playing sports 4. Which of the following activities is NOT popular with their friends at home? A. Watching T.V B. Listening to music C. Do English exercises on the Internet D. Playing computer games 5. What does the passage talk about? A. Nhan and Huong’s friends B. Free time activities of Nhan and Huong’s friends C. Nhan and Huong’s school D. Nhan and Huong’s pastimes

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