{{i}}quEstions 18-20 ArE BAsED on thE Following monologuE introDuCing A nAturE tEnDEnCy oF plAnts. you now hAvE 15 sEConDs to rEAD quEstions 18-20.{{/i}}

trEEs in rAinForEsts hAvE BroAD lEAvEs. thE ADvAntAgE is______.A．to ACCEpt morE sun light
B．to EnCourAgE thE hEAvy rAin to run oFF thE lEAvEs
C．to shADE thEir roots
D．to hiDE thEir trunk