无排卵性功血常见于 A．青春期 B．育龄期 C．绝经过渡期 D．绝经后期 E．哺乳期

防震挡块

十一假期，小亮与父母乘长途客车外出旅游，小亮看见前面的小轿车与他的距离保持不变，而后面的大卡车却离他越来越远。如果以小轿车为参照物，长途客车是            的（选填“静止”或“运动”），大卡车是              的（选填“静止”或“运动”)。客车司机要求乘客在车厢内不要走动，他是以             为参照物的。

(10分)如图所示，A、B两物体叠放在水平地面上，已知A、B的质量分别为m_A=10kg，m_B=20kg，A、B之间，B与地面之间的动摩擦因数为μ=0.5。一轻绳一端系住物体A，另一端系于墙上，绳与竖直方向的夹角为37°今欲用外力将物体B匀速向右拉出，求所加水平力F的大小，并画出A、B的受力分析图。

（取g=10m/s²，sin37°=0.6,cos37°=0.8）

In one way of thinking, failure is a part of life. In another way, failure may be a way towards success. The “spider story” is often told. Robert Bruce, leader of the Scots in the 13th century, was hiding in a cave from the English. He watched a spider spinning a web（蜘蛛织网）. The spider tried to reach across a rough place in the rock. He tried six times without success. On the seventh time he made it and went on to spin his web. Bruce is said to have taken heart and to have gone on to defeat the English… Edison, the inventor of the light bulb, made hundreds of models that failed before he found the right way to make one.

So what? First, always think about your failure. What caused it? Were conditions right? Were you in top from yourself? What can you change so things will go right next time?

Second, is the goal（目标）you’re trying to reach the right one? Try to do some thinking about what your real goals may be. Think about his question, “If I do succeed in this, where will it get me?” This may help you prevent failure in things you shouldn’t be doing anyway.

The third thing to bear in mind about failure is that it’s a part of life. Learn to “live with yourself” even though you may have failed. Remember, “You can’t win them all.”

小题1: This passage deals with two sides of failure. In paragraph 1, the author talks mainly about __         .

A．the value of failure

B．how people would fail

C．famous failures

D．the cause of failure小题2:The underlined phrase “made it” means ______ .

A．succeeded

B．failed

C．gave

D．got小题3:The lesson the spider taught Robert Bruce seems ______ .

A．productive

B．straight forward

C．sorrowful

D．deep小题4:The author tells you to do all things except ______ .

A．The think about the cause of your failure

B．to check out whether your goals are right for you

C．to consider failure as a part or life

D．to bear in mind that you will never fail in your life小题5: Which of the following is NOT true?

A．Bruce and Edison were successful examples.

B．Failure may be regarded as a way toward success.

C．Edison learned a lot from the lesson the spider taught Robert Bruce.

D．One may often raise a question whether his goals are worth attempting.

本身具有活性，在体内不发生代谢或化学转化的药物是

A．代谢拮抗物
B．生物电子等排体
C．前药
D．硬药
E．软药