问题 解答题

食物中的六大营养中,人体中含量最多的物质是______;构成人体细胞的基本物质是______,人体受损细胞的修复与更新都离不开它;既不参与构成人体细胞,又不为人体提供能量,但对人体的作用是其他营养物质不能代替的营养物质是______.

答案

人体中含量最多的物质是水,约占人体的三分之二,蛋白质是构成人体细胞的基本物质,对于身体的生长发育以及细胞的修复和更新有主要作用;糖类是人体最重要的供能物质,脂肪是人体内备用的能源物质,维生素既不是构成组织的主要原料,也不是供应能量的物质,但它对人体的各项生命活动有重要的作用;无机盐是构成人体组织的重要原料.

故答案为:水;蛋白质;维生素

阅读理解

Life is difficult.

It is a great truth because once we truly understand and accept it, then life is no longer difficult.

Most do not fully see this truth. Instead they complain(抱怨) about their problems and difficulties as if life should be easy. It seems to them that difficulties stand for a special kind of suffering especially forced on them or else on their families, their class, or even their nation.

What makes life difficult is that the process of facing and solving problems is a painful one. Problems, depending on their nature, cause sadness, or loneliness(孤独) or regret or anger or fear.

These are uncomfortable feelings, often as painful as any kind of physical pain. And since life causes a lot of problems, life is always difficult and is full of pain as well as joy.

Yet, it is in this whole process of solving problems that life has its meaning. Problems are the serious test that tells us success from failure. When we want to encourage the growth of human spirit, we encourage the human ability to solve problems, just as in school we set problems for our children to solve. It is through the pain of meeting and working out problems that we learn. As Benjamin Franklin said, “Those things that hurt, instruct(指导).” It is for this reason that wise people learn not to fear but to welcome the pain of problems.

小题1:Which sentence best express the central point of the passage?

A.Problems and difficulties represent a special kind of suffering.

B.We become stronger by facing and solving problems of life.

C.Life is difficult because our problems bring us pain.

D.People like to complain about their problems.小题2:The writer probably used just one short sentence in the first paragraph to ___.

A.save space

B.persuade readers

C.make readers laugh

D.get readers’ attention小题3:The main idea of paragraph 3 is that _________.

A.most people feel life is easy

B.the writer feel life is easy

C.the writer likes to complain about his problems

D.most people complain about how hard their lives are小题4:According to the passage, we give school children difficult problems to solve in         order to ______.

A.encourage them to learn

B.teach them to fear the pain of solving the problems

C.help them learn to deal with pain

D.teach them how to respect problems小题5:The saying from Benjamin Franklin “Those things that hurt, instruct” suggests   that ______.

A.we do not learn from experience

B.we do not learn when we are in pain

C.pain teaches us important lessons

D.pain cannot be avoided

单项选择题