【单选题】Cellulose is an important structural component of the primary cell wall of green plants, many forms of algae and the oomycetes. Some species of bacteria secrete it to form biofilms. Cellulose is the m...
【简答题】Directions: Read the following text from which 10 words have been removed. Choose from the words A-0 the most suitable one to fill each numbered gap in the text (1-10). There are FIVE extra words that...