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%.

二、詞匯與語法知識:共15小題;每題1.5分,共22.5分。從每小題的四個選擇項中,選出最佳的一項。
6.-Was the gentleman's name David?
-No.I don't think so,but＿＿,go on,please.

• A、many thanks
  

• B、I'd like to

• C、not at all

• D、never mind