问题 问答题

托盘天平放在水平桌面上,旋转平衡螺母使横梁在水平位置上平衡,但忘掉了将游码放在标尺左端的“0”刻线上,这样称出的物体的质量要比它的真实值将偏______

答案

假设游码放在0.2g位置把天平调平了,在左盘放10克的物体,右盘肯定放上10克的砝码天平才能平衡,但读数时还要把游码加上,读出的结果是10.2g,所以测得的质量比真实值偏大.

故答案为:大.

阅读理解

Kristy, 28, a cook in La Gross, often wondered what she’d do in a life-threatening situation. On August 29, she got her answer. While she was driving on a road, a big truck hit its head on a pickup car. The pickup car burst into flames. Kristy rushed out and ran to the pickup. Two farmers, Dean Berhard, 51, and his brother Donald, 44, were inside.

When she got close, Kristy could see the unconscious driver. The other man was under the passenger seat. Kristy says, “The smells were sickening. I was afraid the truck would blow up and kill us all.”

The driver of the big truck was struggling to open the passenger door, so Kristy rushed to the driver’s side. Finally they opened the door. She reached in, seized the driver and , to her horror, felt her hands sink into his chest. She quickly dragged the man to safety on the roadside, then hurried back. As Kristy stared down the ditch (水沟) with the passenger, the pickup blew up. She jumped on top of him and they both rolled to safety.

When the police arrived a while later, Kristy started crying, “I want my mum.” In fact she cried for the next three months.

Today the two farmers, each the father of two children, are good friends with Kristy. To show their deep appreciation, they bought her a ring with nine diamonds —one for each member of their immediate families, and ninth for her.

小题1:In which order did Kristy do the following things?

a. Carried Dean and Donald to safety

b. Rushed to the pickup

c. Surprised herself

d. Saw the truck hit on the pickup

e. Got out of her car

f. Wondered what she’d do in danger

A.e, d, b, a, c, f

B.d, e, b, a, f, c

C.f, d, e, b, a, c

D.f, c, e, d, b, a小题2: When coming to save Donald and Dean Bernard, Kristy never thought that she ________.

A.could have any help from others

B.would fail to save both of them

C.might be killed

D.would be tested in a dangerous situation小题3: Which of the following best shows Kristy’s true heroism(英雄行为)?

A.She remained calm during and after the accident.

B.She protected herself as well as the two brothers from harm.

C.She put her life “on the line” to save others.

D.She was regarded as a member of Dean’s and Donald’s families.小题4: This sentence “The pickup burst into flames.” in the first paragraph means “_____.”

A.The pickup was on fire

B.The pickup started smoking badly

C.A terrifying cry came out of the pickup

D.The pickup was broken into pieces小题5: Kristy cried because she _________.

A.was badly wounded

B.had never experienced such a situation

C.was too excited at the result

D.regretted not putting out the fire

多项选择题