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

第1题

______ is known to us all, the United States ______ fifty states. A．It; are made up of B

______ is known to us all, the United States ______ fifty states.

A．It; are made up of B．As; is made up of

C．That; is made of D．What; are divided into

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第2题

All the following statements are true EXCEPTA．a relatively small number of the volunteers

All the following statements are true EXCEPT

A．a relatively small number of the volunteers had large or fast-growing nodules.

B．almost all those with large or fast-growing nodules were found to have lung cancer.

C．all the volunteers were at high risk for lung cancer.

D．most of the volunteers tested negative during screening.

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第3题

An investigation was made into the accident, ______ fifty people were killed.A．for thatB．w

An investigation was made into the accident, ______ fifty people were killed.

A．for that

B．when

C．where

D．in which

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第4题

The number of people invited to the prty ____ fifty, but number of them ____bsent for diff

erentThe number of people invited to the prty ____ fifty, but number of them ____bsent for different resons.were; ws B．ws; ws C．ws; were D．were; were

A．were; was

B．was; was

C．was; were

D．were; were

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第5题

All the following statements are true EXCEPTA．a relatively small number of the volunteers

All the following statements are true EXCEPT

A．a relatively small number of the volunteers had large or fast-growing nodules.

B．almost all those with large or fast-growing nodules were found to have lung cancer.

C．all the volunteers were at high risk for lung cancer.

D．most of the volunteers tested negative during screening.

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第6题

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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第7题

The number of people invited ______ fifty, but a number of them ______ absent for different reasons.

A) were, was B) was, was C) was, were D) were, were

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