证券投资基金与银行储蓄存款有较大差别，主要表现在（）。A．性质不同 B．收益与风险特

阅读理解。

     Animals seem to have the sense to eat when they are hungry and they do not eat more than their bodies

need. It has been shown that rats will, when given a choice over a period of time, prefer water with

vitamins to water without vitamins even there is no difference in taste or smell between the two water

bottles. When a fragrant flavor (香味) was added to the vitamin-enriched water, the rats did seem to

develop a taste for it and kept drinking it, even after the vitamins were switched to the clear water. In time,

however, they broke the habit and went back to where the necessary vitamins were.

     In a classic experiment, babies of 6 to 12 months old were placed in a cafeteria feeding arrangement,

with a wide selection of baby food before them. They were given whatever they pointed to or appeared

interested in. We are told that at first they showed some unusual eating patterns (方式), but over a period

of time they managed to select well-balanced diet.

     So, in selecting food, rats and babies do seem to know and act on what's best for them. Apparently,

there is a kind of "body wisdom", which humans soon lose. Most of us do not eat as wisely as we could. Many of our food preferences are culturally determined and influenced by long established habits. Some

people eat foxes, dogs and blackbirds, while we eat cows and pigs. So what people eat and how much

they eat seems to be greatly influenced by what is going on around them.

1. As far as their eating habits are concerned, babies and rats are similar in that both _____.

A. have the natural abilities to choose a balanced diet

B. develop a taste for the same kinds of flavors

C. have the same eating patterns

D. prefer flavored food and drink

2. In the experiment on rats, a fragrant flavor was added to the water to _____.

A. prove that vitamins are tasteless

B. find out rats preference in flavor

C. encourage rats to drink vitamin-enriched water

D. test whether rats know which drink is good for them

3. According to the passage, adults eating habits differ from those of babies because _____.

A. adults have more choices of food than babies in eating patterns

B. adults usually cannot resist the temptation of various delicious food

C. adults' eating habits are closely related to the social and culture customs

D. adults know better than babies what kinds of food are good for their health

函数f（x）=（k+1）x+b在实数集上是增函数，则有（　　）

A．k＞1

B．k＞-1

C．b＞0

D．b＜0

小明将手机悬挂在密闭的玻璃瓶中，用抽气机抽去瓶中的空气，打电话呼叫瓶内的手机．手机______（能/不能）收到呼叫信号，这说明______；你______（能/不能）听到瓶内手机的声音，这说明______．

下列属于轮廓控制型数控机床是（）。

A、数控车床

B、数控钻床

C、加工中心

D、数控镗床

中共八大关于国内主要矛盾的论断是正确的，因为这一论断（）。

A、借鉴了苏联的经验教训

B、反映了剥削阶级在我国已经基本被消灭的客观实际

C、明确了把正确处理人民的内部矛盾作为国家政治生活的主题

D、强调了团结一切可以团结的力量，为社会主义建设服务