D．possible

　　18．A．listen

　　B．see

　　C．learn

　　D．write

　　19．A．decision

　　B．choice

　　C．promise

　　D．difference

　　20．A．however

　　B．though

　　C．instead

　　D．too

　　Ⅲ．阅读理解

　　Plants that live in the rainforest have adapted in amazing ways to several very difficult conditions．This means that the plant has changed something in its “body” or “habits” to make it easier to survive in difficult conditions．There are several conditions they have had to adapt to．First，the soil of the forest floor is shallow．Also，the soil of the rainforest is not very rich，or easy to grow in．Next is the problem of very heavy rain which continues over a large part of the year．Finally，many plants of the rainforest are food for animals that live there．

　　The biggest problem that rainforest plants have to adapt to is the lack of sunlight in the rainforest’s lower levels．Plants have adapted to this problem in several ways．Many plants have very large leaves．The large leaf is helpful because it has a bigger surface area．The bigger surface area a leaf has，the more sunlight it can absorb．The canopy trees adapt by growing to be 100 feet tall so that their leaves can grab all available sunlight．Other plants called lianas (climbing woody vines) have adapted by rooting themselves in the soil of the forest floor and growing up the trees until they reach the canopy layer．Still other plants，such as epiphytes，have adapted by growing directly on the trees’ trunks and branches in the canopy and understory layers of the rainforest．

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