单项选择题

The step-test was given ______.

A．at the beginning and at the end of the 7-week period
B．after each exercise period
C．only at the beginning of the 7-week period
D．only at the end of the 7-week period

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单项选择题

Social scientists do NOT study ______.

A．marriage in different countries
B．the differences between life in rural and urban areas
C．how a satellite is launched
D．family life

单项选择题

When were pulse rates taken

A．After every exercise period.
B．Every time the ratio of active riding was increased.
C．Every day.
D．After each step-test.