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55＿＿

46.How much of the land surface on Earth is covered by rainforests?

• A、More than 50%.
• B、Nearly 12%.
• C、Less than 5.3%.
• D、Around 22.5%.

9.Once Johnny starts painting a picture,he won't stop until it＿＿

• A、had been finished
• B、was finished
• C、is finished
• D、will be finished