上海有多少人知道自己需要什么样的食品？（）。A、50% B、40% C、30%

不是栈的基本运算的叙述是______。

A．从栈顶删除一个元素

B．判断一个栈是否为空

C．在栈中的第i个元素之前插入一个新元素

D．读取栈顶元素的值

I will visit Austria ______ the invitation of my friend this summer vacation．

A．by

B．for

C．to

D．at

发行人计划实施超额配售选择权的，应当提请股东大会批准，因行使超额配售选择权而发行的新股东不能作为本次发行的一部分。 ( )

Your body, which has close relation with the food you eat, is the most important thing you own. So it needs proper treatment and proper nourishment(营养).

The old saying “An apple a day keeps the doctor away” is not silly as some people think. The body needs fruit and vegetables because they contain vitamin C Many people take extra vitamins in the form of pills(药丸), believing that these will make them healthy. But a good diet is made up of nourishing food and this gives all the vitamins you need. The body doesn’t need or use extra vitamins. So why waste money on them?

In the modern western world many people are too busy to care about eating properly. They throw anything into their stomachs, eating hurriedly and carelessly. The list of illness caused or made worse by bad eating habits is frightening.

小题1:The old saying in the passage tells us that_______.

A．the apple is the best among all kinds of fruits.

B．apple can take the place of doctors.

C．eating apples regularly (有规律的) does lots of good to our health.

D．an apple is a sure cure for illness.小题2:In the second paragraph the writer tries to let us know______.

A．our bodies need food or we can’t live.

B．often eating apples is a good habit.

C．taking extra vitamin pills is completely useless.

D．a good diet is very important to our health.小题3:From the passage we can draw a conclusion that if we want to keep healthy, we should______.

A．only eat an apple a day.

B．eat properly.

C．take as many vitamins pills as possible.

D．throw food into our stomachs slowly and carefully.

泵的线性尺寸几何相似地均放大一倍时，对应工况点的流量、扬程、轴功率将各增到原来的8倍、4倍和16倍。