E6 Unit4.1

1. Most of the marine pollutants come from ________-based human activities.

• A. Land
• B. Ocean

2. Which of the following wastes takes the longest time to decompose?

• A. Plastic bottle
• B. Plastic bag
• C. Glass bottle
• D. Aluminium can

3. Dredging of sea sand for reclamation will turn up heavy metals and worsen the water quality.

• A. True
• B. False

4. The more the carbon dioxide emitted, the _________ the pH of seawater.

• A. Higher
• B. Lower

5. What is the source of marine pollution as shown in the photo below?

• A. Farming activities
• B. Textile industry
• C. Nuclear power generation
• D. Ship accidents