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Fifty volunteers were alphabetically divided into two equal groups. Group A to participate

in a 7-week exercise program, and Group B to avoid deliberate exercise of any sort during those 7 weeks. On the day before the exercise program began, all 50 men participated in a step-test. This consisted of stepping up and down on a 16-inch bench at 30 steps a minute for 5 minutes. One minute after completion of the step-test, a pulse rate of each subject was taken and recorded. This served as the pretest for the experiment. For the next 7 weeks, subjects in the experimental group (Group A) rode an exercycle for 15 minutes each day. The exercise schedule called for riders to ride relaxed during the first day's ride, merely holding on to the handle bars and foot pedals as the machine moved. Then, for the next 3 days, they rode relaxed for 50 seconds of each minute, and pushed, pulled, and pedaled actively for 10 seconds of each minute. The ration of active riding was increased every few days, so that by the third week it was haft of each minute, and by the seventh week the riders were performing 15 solid minutes of active riding.

At the end of the 7 weeks, the step-test was again given to both groups of subjects, and their pulses taken. The post exercise pulse rates of subjects in the experimental group were found to have decreased an average of 30 heart beats per minute, with the lowest decrease of 28 and the highest decrease of 46. The pulse rates of subjects in the control group (Group B) remained the same or changed no more than 4 beats, with an average difference between the initial and final tests of zero.

How many people were in each group?

A.100.

B.25.

C.50.

D.15.

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更多“Fifty volunteers were alphabet…”相关的问题
第1题
Fifty volunteers were alphabetically divided into two equal groups. Group A is to partic
ipate in a 7-week exercise program and Group B is to avoid planned exercise of any sort during those 7 weeks. On the day before the exercise program began, all 50 men participated in a step-test. This consisted of stepping up and down on a 16-inch bench, at 30 steps a minute for 5 minutes. One minute after completion of the step-test, the pulse rate of each subject (被测试者 ) was taken and recorded. This served as the pretest for the experiment. For the next 7 weeks, subjects in Group A rode an Exercycle (机器脚踏车 ) for 15 minutes each day, while Group B remained doing no planned exercises.At the end of the 7 weeks, the step-test was again given to both groups of subjects, and their pulses taken. The post-exercise pulse rates of subjects in the experimental were found to have decreased an average of 30 heart beats per minutes, with the lowest decrease 28 and the highest decrease 46. The pulse rates of subjects in the control group remained the same or changed no more than 4 beats, with an average difference between the initial and final tests of zero.

1).The step-test was given ()

A、after each exercise period

B、at the beginning and at the end of the seven week period

C、only once, at the beginning of the seven week period

D、twice to the men in Group A and once to the men in Group B

2).The post-exercise pulse rates of Group B were found on the average to have ()

A、not changed

B、gone down 28 beats per minute

C、gone down 30 beats per minute?

D、gone down 4 beats per minute

3).How many people were in each group? ()

A、100

B、50

C、25

D、15

4).What did Group A in their program? They ()every day.

A、stepped up and down on a bench

B、pushed and pulled on exercise handles

C、rode on an Exercycle

D、refrained from any exercise

5).When was pulse taken? ()

A、After every exercise period

B、Every day

C、Every time the ratio of active riding was increased

D、After the step-test

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第2题
海蓝之谜的logo是哪一个()

A.LA NER

B.LA WER

C.LA prairie

D.LA MER

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第3题
A small percentage of the grain ______ ruined by the prolonged rain. A. was B. wer

A small percentage of the grain ______ ruined by the prolonged rain.

A. was

B. were

C. is

D. are

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第4题
中国青少年机器人竞赛中的WER教育机器人工程挑战赛每队是多少人()

A.1人

B.2人

C.3人

D.4人

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第5题
In the 60s and 70s,beauty queens .A. were sponsored by dry-cleaning companies B. wer

In the 60s and 70s,beauty queens .

A. were sponsored by dry-cleaning companies

B. were admired by most people

C. did not have a good reputation

D. got free clothes from supermarkets

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第6题
According to the passage, a pair of pandas is to be sent to the USA after______.A.they wer

According to the passage, a pair of pandas is to be sent to the USA after______.

A.they were born in the city of Chengdu

B.they were caught in Sichuan Province

C.the USA paid $ 4 million to China

D.three year's discussion of the two cities

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第7题
The White House praised volunteers for their efforts().

A.metonymy

B.alliteration

C.metaphor

D.personification

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第8题
The volunteers must have broadened the road yesterday, _______?A.mustn’t theyB.haven’t the

The volunteers must have broadened the road yesterday, _______?

A.mustn’t they

B.haven’t they

C.didn’t they

D.weren’t they

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第9题
More()are needed to help us finish the hard work.

A.time

B.volunteer

C.times

D.volunteers

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第10题
Thank You, Volunteers!By the end of each year, we'd try to show our appreciation to thos

Thank You, Volunteers!

By the end of each year, we'd try to show our appreciation to those volunteers who have helped to make life more beautiful. Therefore, it’s in December that we tend to think of a way in which we could show our thanks to them. Here are some posts online to thank those who have volunteered to offer all kinds of help.

Potlucks for Staff and Volunteers

(1) I like to hold potlucks at the office and invite volunteers to make them feel like part of the team. The volunteers are asked to bring with them a big appetite. (Posted on 29 December, 2018 by Nazia Anderson)

Giving Cards to Volunteers

This year I sent out thank-you cards to the volunteers. It’s a great way to show our thanks toward the end of the year, and (2) this makes our volunteers know we’re grateful to them for what they’ve done in the busy year. (Posted on 1 December, 2018 by Traci Lato)

Hats Off to Volunteers

Our library volunteers received various baskets of goodies, boxes of chocolates, flowers and plants, etc. The staff wore hats all week and tipped them toward the volunteers as we saw them. The volunteers here seemed to appreciate the silent effort to recognize them. (Posted on 20 December, 2018 by Aimee Hepler)

Afternoon at the Movies

During National Volunteer Week we recognized our volunteers by taking them to the movies. (3) We had our recognition awards program before the movie started, followed by a 15-minute coffee break. The volunteers had a bag of popcorn and a drink waiting for them. They also had their choice of 2 movies. It was very well received and we will do it again next year. (Posted on 23 December, 2018 by Linda Bacon)

Pat on the Back

Here’s a very inexpensive idea that should work for any type of organization. I simply draw around my hand on a piece of paper, print “Here’s a pat on the back for You, Mr. / Ms. for all the hard work and effort you’ve made here”, then copy it onto colored paper. The teens at our community help me cut them out. (Posted on 20 December, 2018 by Wu Qing)

(1)、What is the main idea of this passage?

A、Different ways to show thanks to volunteers.

B、We should to be volunteers.

C、Volunteers are important for us.

(2)、Why is it in December that we tend to think of a way to thank volunteers?

A、Because it is by the end of a year.

B、Because it is the beginning of the year.

C、Because it is important in a year.

(3)、Why does Nazia hold potlucks at the office and invite volunteers?

A、To fulfill her wish to be a volunteer

B、To show thanks to them and make them feel like part of the team.

C、To organise an activity to show the importance of the volunteers.

(4)、What is the purpose for Traci to send out thank-you cards to the volunteers?

A、She wants to tell the people how important the volunteers are.

B、She wants to show her ability to make cards

C、She wants to make the volunteers know people are grateful to them for what they’ve done in the busy year.

(5)、Why does Linda want to do her award program again next year?

A、Because it is fresh and interesting.

B、Because she likes.

C、Because it seems to be well received.

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第11题
fifty()

A.五

B.五十

C.十五

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