问题 选择题

下列关于达尔文自然选择学说的叙述,不正确的是(  )

A.生物多样性和适应性是自然选择的结果

B.生物的变异是固定不变得

C.生物通过生存斗争,适者生存、不适者被淘汰

D.生物进化方向由环境的定向选择决定

答案

A、生物生存的环境是多种多样的,生物对环境的适应形成了生物的多样性,因此生物的适应性和多样性都是自然选择的结果,A正确.

B、生物的变异丙不是固定不变的,生物体的变异是没有固定方向的,既可以是有利变异也可以是不利变异,B错误.

C、自然界中的生物,通过激烈的生存斗争,适应者生存,不适应者被淘汰掉,这就是自然选择,C正确.

D、生物通过遗传、变异和自然选择,不断进化.环境的定向选择作用决定着生物进化的方向,D正确.

故选B

阅读理解

                              A

When you think of success, you think of relative achievements in your own world. Each element of your world is important to you, and there is no need to compare with others. You cannot affect the success of others; you can affect your own success.

Success is very much achievable to everybody. Believe that and you have taken the first step. If you do not believe in yourself, then building self-esteem is your first task. However, believing in your ability to achieve whatever you want to succeed in is very important if you are not to be held back by self-doubt throughout your journey to success.

There are many things that will affect your ability to succeed, and it is best to focus on those under your immediate control. Once you do that, then the characteristics you develop can be applied to becoming successful in a range of activities.

What is important to you is that, as you start to reach milestones in your ambitions, you should appreciate your own achievements. Appreciating yourself will strengthen your self-confidence and your determination to succeed.

Some of the key characteristics you will find in those who are successful are perseverance, prepared to research, plan, work hard and practice a lot even when things do not seem to be going well, and an ability to recover and learn from setbacks. At the beginning of whatever you are trying to succeed in, a strong vision of your future, planning, and setting yourself achievable tar gets can all play an important role.

All these qualities, skills and characteristics can be learned and developed. But it is up to you to get things started. Those who do not start travel nowhere. For others, life can be a continuous journey of fulfillment.

小题1:56. According to the passage, if you want to achieve success, what should you do first?

A.Don’t compare with others.

B.Bring everything under control.

C.Find out what you have in mind.

D.Feel confident about your ability.小题2:57. Why should you appreciate your own achievements according to the passage?

A.It will allow you to recover from past failures.

B.It will remind you of the vision of your future.

C.It will motivate you to continue pursuing success.

D.It will help you develop your characteristics in everything.小题3:58. The underlined word“setbacks”(in paragraph 5)probably means ________.

A.failures

B.troubles

C.hesitation

D.depression小题4:59. What can we learn from the last paragraph?

A.If you are stuck where you are, you cannot travel far.

B.If you don’t start trying, you’ll never embrace success.

C.If you are brave enough, you can get whatever you want.

D.If you don’t study, you can never reach the destination.

单项选择题