请根据题意回答下列问题．[在下列（1）（2）两小题中任选一题回_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题问答题

请根据题意回答下列问题．[在下列（1）（2）两小题中任选一题回答，若两小题都回答，则以第（1）小题的答案来评定分数．]

（1）厨房中有两瓶失去标签的酱色液体，只知它们分别是酱油和食醋，请你利用家庭现有条件把它们区别开来（至少用两种方法）．简要写出方法、现象和结论．

（2）黄金饰品中的假货常常鱼目混珠，社会上有些不法分子时常以黄铜（锌、铜合金）冒充黄金进行诈骗活动．因为黄铜单纯从颜色、外形上看，与黄金极为相似，所以很难区分．请你用物理方法和化学方法分别设计一个实验方案鉴别真假黄金，简要写出方法、现象和结论．

答案

（1）①闻味道．有酸味的是食醋，没有酸味的是酱油；

②分别取两种液体少许放到两个容器中，向其中加入小苏打，有气泡冒出的是食醋，无现象的是酱油．

（2）①分别取两种物质一小块，放进烧杯，滴加盐酸，产生气泡的是黄铜，无现象的是黄金；

②因为黄金质软，可以用牙咬，有牙印的是黄金，没有牙印的是黄铜．

单项选择题

颈交感干（）。

A.由颈上、中、下交感神经节及其节间支组成

B.颈下神经节最大，位于第6颈椎横突的前方

C.颈中神经节多与颈下神经节融合为星状神经节

D.颈上神经节最小或不明显，位于第2～3颈椎前方

E.以上都不对

完形填空

完形填空（共20小题；每小题1．5分，满分30分）
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。
Isabel Powell likes to swim. It’s a（n） 1  thing that she shares with a movie star she’ll
be meeting later this year—a star whose life story is coming to a theater near you this month.
Who’s the star? A dolphin named Winter. And   2  is not the only thing that she and Isabel have in common.
Winter lost her   3  when she was a baby. She got it caught in a trap used to   4__  crabs. Isabel, who had a similar experience to Winter, once had a   5  life.   6  , when she was 2 a tumor（肿瘤）on her foot   7  her leg.
Now, both Winter and Isabel   8  artificial limbs. In Isabel’s case, it’s an artificial leg and foot. In Winter’s case, it’s an artificial tail.
In November, Isabel will travel from her home to Clearwater, Florida, to   9  Winter. Clearwater is the site of the aquarium（水族馆）where Winter has lived since she was   10  from that trap.
According to the Kitsap Sun, the meeting was set up by the man who designed Winter’s artificial tail—Kevin Carroll. Carroll also   11  artificial limbs for people.
He and Isabel   12  met last month in Bremerton, Washington, at the 13  where she got her artificial leg, which freed her of the   14  that had troubled her for years.   15__  Carroll met Isabel and found out she wants to be a veterinarian （兽医）, he decided to set up the meeting.
She   16  people who’ve lost limbs by   17  them they can still do the things they used to do. According to the Kitsap Sun, she plays softball,   18  karate competition and chases after her dog, too. For years, she didn’t know anybody else who had an artificial limb. Now, she’s about to meet a movie star who has one, too.
And she no longer feels so   19   . “I think it’s pretty cool,” Isabel told Kitsap Sun reporter Chris Henry. “Winter has an artificial tail. That makes me think that I’m not the only   20  one. There are thousands more.”

A．interesting

B．disappointing

D．frightening

A．Undoubtedly

B．Unfortunately

D．Surprisingly

B．deliberately

A．participates in

B．struggles for

D．enthusiastic