题目内容
（请给出正确答案）
What conditions are needed for shrubs to become established？
A．Ferns must take root.
B．The ground must be covered with grass.
C．More soil must accumulate.
D．Smaller plants must die out.
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更多“What conditions are needed for shrubs to become established？A．Ferns must take root.B．The g”相关的问题
A、Vertical bar charts
B、Pie charts
C、Horizontal Bar
D、Line Chart
A、moving northeast to a new indifference curve will increase utility.
B、points on the same indifference curve yield equal utility.
C、the axes represent levels of utility for each of the goods.
D、indifference curves cannot cross.
A、at a constant angle of bank
B、in a turn in the opposite direction
C、straight and level
A、participated
B、participating
C、participate
D、had participated
A、Responsibility for the level of sales, production costs, collection of debts and payment of suppliers
B、Responsibility for the level of sales, production costs and treasury functions
C、Responsibility for the level of sales, production costs and purchase of new fixed assets
D、Responsibility for the level of production costs, treasury functions and collection of debtors and payment of suppliers
A、The arithmetric mean and median only.
B、The median and mode only.
C、The mode and geometric mean only.
D、The arithmetic mean and mode only.
The other thing to be avoided is clinging tightly to youth in the hope of sucking vigor from its vitality. When your children are grown up they want to live their own lives, and if you continue to be as interested in them as you were when they were young, you are likely to become a burden to them. I do not mean that one should be without interest in them, but one's interest should be thoughtful and, if possible, kindly but not unduly emotional. Animals become indifferent to their young as soon as their young can look after themselves, but human beings, owing to the length of early childhood, find this difficult.
I think that a successful old age is easiest for those who have strong impersonal interest involving appropriate activities. It is in this sphere that long experience is really fruitful, and it is in this sphere that the wisdom born of experience can be exercised without being oppressive. It is no use telling grown-up children not to make mistakes, both because they will not believe you, and because mistakes are an essential pan of education. But if you are one of those who are incapable of impersonal interest, you may find that your life will be empty unless you concern yourself with your children and grandchildren. In that case you must realize that while you can still render them material services, such as making them an allowance or knitting them sweaters, you must not expect that they will enjoy your company.
The passage is mainly about ______.
A．how to deal with old age
B．how to cultivate impersonal interests
C．how to get along with your children
D．how to deal with old people
A．People break their large scale computer systems up into smaller subsystems for security purposes.
B．Personal computers are most likely to be invaded by unauthorized persons.
C．All of the people invading computer systems are trying to spy or sabotage.
D．Some people penetrate into protected databanks in order to prove their technical worth.
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