45.What can be seen in a rainforest according to the text?

• A、Leaves and branches of a tree never actually touch those of the other trees.
• B、Tree diseases make life more difficult for leaf-eating insects.
• C、Tall trees protect themselves from forest animals with their branches.
• D、The ground floor is all covered by leaves and branches.

51＿＿

( 24)＿

• A、dangerous
• B、Wise
• C、interesting
• D、hard