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短文填空
Travel is useful to us in at least three ways.
First, by t 1 we can enjoy the beautiful scenery(风景)of different place.We can see many which can be read about in books w 2 our eyes and v 3 some famous cities and interesting places.
S 4 , we will meet people with different interests and see strange and different things when we travel.We can get ideas of the conditions and customs(风俗)of o 5 people, taste different foods and local favors(偏爱)if we like.I 6 this way, we can understand how other different people live.
Third, travel will help us gain(获得)k 7 of geography and history , travel will also help us keep h 8 and strong.
With all these a 9 of travel, it is no wonder that travel has now become more p 10 than ever in China.
阅读理解
阅读下面短文,然后按要求做题.
take phrasal verbs
take after sb, phr. v [T not in progressive form]to look or behave like (an older relative): Mary really takes after her mother; she has the same eyes, nose and hair.
take off phr. v
1.[T](take sth, off) to remove (esp. clothes): Take your coat of f. opposite put on.
2.[I](of a plane, spacecraft, etc.) to rise into the air at the beginning of a flight.
3.[T](take sb. off) informal to copy the speech or manners of (someone), esp. for amusement; mimic: The actor made everyone laugh by taking off the members of the royal family.
4.[T](take sth, off) to have a holiday from work on (the stated day) or for (the stated period): I'm taking Thursday off because 1'm moving house./Take a few days off, Michael.
5.[I]to begin to become successful, popular, or well-known: It was at this point that her acting career really took off.
6.[I]informal to go away, esp. on a journey or to leave in a hurry: She just took off without saying goodbye to anyone.
take (sth.) over phr. v
[I; T]to gain control over and be responsible for (something): Who do you think will take over now that the governor has Left./I'm feeling too tired to drive any more; will you take over?
take to sb./sth. phr. v
[T]to feel a liking for, esp. at once: I took to Paul as soon as we met./I'm not sure if he'll take to the idea.
take sb./sth, up phr. v [T]
1.to begin to spend time doing; interest oneself in:John took up acting while he was at college. [+-ving]Alfred's just taken up playing the guitar.
2.(of things or events) to fill or use (space or time) esp. in a way that is unpleasant:The job took up most of Sunday./These boxes of yours are taking up too much space.
3.to continue:I'll take up the story where I finished yesterday.
注释:amusement n.娱乐活动 gain vt.获得
mimic adj.模拟的 responsible adj.有责任的
根据短文内容选择最佳
1.Which “take off” in the following sentences has a different meaning?
[ ]
A.I took a week off in October and I'm taking off Thanksgiving, too.
B.Everyone takes Christmas off.
C.She used to take off her teacher to make her friends laugh.
D.You need a break. Why not take a fortnight off from work?
2.Melissa ________ her father in being generous.
[ ]
3.“Today, we are to ________ Unit 11, Planting trees.” Our teacher said to us at the very beginning of the class.
[ ]
4.He will ________ my job while I ________ a week ________ for New York.
[ ]
A.take after, take…to
B.take up, take…after
C.take to, take…over
D.take over, take…off
5.I ________ her the moment I met her.
[ ]
实验一:将空白琼脂和含EDTA的琼脂做成帽状,分别套在甲、乙两组玉米胚根的根冠外(示意图如下)。提示:EDTA的作用是去除与其临接部位的 Ca2+。
将胚根水平放置培养一定时间后,观察到甲组胚根向重力(下)生长,乙组胚根水平生长。根据上述实验结果,得出实验结论: 。
实验二:水平放置的胚根弯曲向下生长,与根冠近地侧的Ca2+浓度明显高于远地侧有关。研究表明,根总是朝着Ca 2+浓度高的方向弯曲生长。为验证这一结论,有人设计了下列实验方案。请根据提供的实验材料和用具,写出第二步及以后的实验步骤和实验结果,并回答问题。
(1)实验材料和用具:胚根等长的萌发玉米种子,空白琼脂帽,含EDTA的琼脂帽,上面部分含Ca2+的琼脂帽(水平方向),培养皿等。
(2)实验步骤:
第一步:取若干个培养皿,在每个培养皿中放置适量的萌发玉米种子,按实验一中乙组的方法处理胚根一定时间后,移去根冠外的琼脂帽。然后将培养皿平均分成两组,编号为 A组、B 组。
第二步: 。
第三步: 。
(3)实验结果: 。
(4)科学家进一步证实,根冠中生长素的分布受Ca2+浓度影响,当胚根水平放置时,重力诱导Ca2+向根冠下侧移动,导致近地侧的生长素浓度比远地侧高。请分析胚根的生长素分布与向重力生长的关系: 。 查看习题详情和答案>>
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