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46、 Based on the passage, we can make our life happier if we________
A．get rid of useless things
B．buy more things
C．sell things we do not need
D．send things to our friends


47、 Based on the passage, simplifying our life is________
A．nonsense
B．our duty
C．a good piece of advice
D．unrealistic

48、 回答48-67题
There are no inevitable outcomes of social class in child rearing．At the same time, there is noquestion that social class is important factor in how children are raised and the kind of adults thatchildren become．Regarding social class, sociologists have found that parents socialize their children into the behaviors and norms of their work worlds．Members of the working class are closely supervised and are expected to follow explicit rules at their jobs．If they do not follow the precise rules and do as they are told, they will not keep their jobs． Their experience influences how they deal with their children．As a result, their concern is less with their children's motivations and more with their children's outward conformity．Thus they are more apt to use physical punishment in managing their children．On the other hand, middle-class parents, who are expected to take more initiative on the job, are more concerned that their children develop curiosity, self-expression, and self-control．They are also more likely to withdraw privileges or affection than to use physical punishment．

The word "explicit" means________
A．vague
B．difficult
C．confusing
D．clearly defined


49、 According to this passage, working-class parents are more likely than middle-class parents to________
A．use physical punishment for discipline
B．have children who finish college
C．have children who are out of control
D．show less love to their children


50、 Middle-class parents will encourage their children to be________
A．self-confident
B．reliable
C．curious
D．successful


51、 This passage is about________
A．the relation between social class of the parents and their children's rearing
B．the similarities between working class and middle class parents
C．the differences between children of working class and the ones of middle class
D．the relation between working class and middle class in their working places

52、 回答52-71题
It takes a long time to grow a tree．How long? Well, pine trees are the quickest growing trees, butstill, they take twenty years to reach a size suitable for cutting and harvesting．An oak takes about sixty years to grow to a good size．A redwood may take hundreds of years．Lumber companies, which make their money on trees, depend on those that grow quickly．Therefore, they are always looking for methods to make trees grow faster．So far, the secret to fast growing trees seems to lie in " super-seeds．" These are seeds that are gathered from the quickest growing trees in a forest．One company searched 100,000 acres of trees and selected the seeds from just fifteen trees．These two ounces of seed were enough to plant several hundred new trees．Eventually, when these trees have grown, seeds will again be taken only from the fastest growing trees of crop．This process of artificial selection will yield, in the future, a super-tree that will grow in half the time it takes normal trees to develop．Unfortunately, it takes a long time for a plan like this to reach its goal．The Weyerhauser Lumber
Corporation, which started its first collection of seed in 1958, is just now beginning to harvest the
super-seeds of the first generation of the faster growing trees．

This selection centers on________
A．the life span of trees
B．the age of redwoods
C．making trees grow quickly
D．cutting trees for lumber


53、 Trees that grow faster are developed by________
A．planting many trees and fertilizing them
B．collecting seeds from strong, slow growing trees
C．selecting the seeds of the fastest growing trees
D．feeding them high-energy plant foods


54、
Super-trees________
A．will be a great benefit to lumber companies
B．make extra-good lumber for buildings
C．will probably be weak because of their fast growth
D．may be defenseless to many insects and diseases


55、
The word "therefore" in paragraph 2 indicates that a________
A．speech is beginning
B．conclusion follows
C．comparison is being made
D．metaphor is being used

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