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问题 选择题

用食用白醋（醋酸浓度约1 mol/L）进行下列实验，能证明醋酸为弱电解质的是[ ]

A．白醋中滴入石蕊试液呈红色

B．白醋加入豆浆中有沉淀产生

C．蛋壳浸泡在白醋中有气体放出

D．pH试纸显示白醋的pH为2~3

答案

答案：D

多项选择题

影响骨折愈合的局部因素有（）。

A.骨折断端接触的大小

B.骨折段血供情况

C.组织损伤的程度

D.骨折局部有无感染

E.固定是否确实可靠
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单项选择题

阅读下面短文，从短文后各题所给的四个选项（A、B、C 和 D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

                                    A Heroic Driver

Larry works with Transport Drivers. Inc. One morning in 2009. Larry was  41

along 165 north after delivering to one of his    42   . suddenly, he saw a car with its bright lights on.    43    he got closer, he found 44    vehicle upside down on the road. One more look and he noticed    45    shooting out from under the    46    vehicle. Larry pulled over, set the brake and    47   the fire extinguisher (灭火器). Two good bursts from the extinguisher and the fire was put out.

The man who had his bright lights on    48    and told Larry he had    49    an emergency call. They    50    heard a woman’s voice coming from the wrecked (毁坏的) vehicle.    51   the vehicle, they saw that a woman was trying to get out of the broken window. They told her to stay    52    until the emergency personnel arrived,    53    she thought the car was going to    54   . Larry told her that he had already put out the fire and she should not move    55    she injured her neck.

Once fire and emergency people arrive, Larry and the other man    56    and let them go to work. Then, Larry asked the    57    if he was needed or    58    to go. They let him and the other man go.

One thing is    59   —Larry went above and beyond the call of duty by getting so close to the burning vehicle! His    60    most likely saved the woman’s life.

49（）

A.returned

B.received

C.made

D.confirmed
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