单项选择题

A．Because they have some financial problems.
B．Because there will be much rain in May.
C．Because they won’’t have free time until after May.
D．Because they won’’t have got everything ready by then.
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单项选择题
One of the major difficulties of research into human health problems is the difficulty of ______.
A．knowing how many factors there are
B．isolating particular, individual factors from the complex human environment
C．knowing the complex human environment
D．increasing the number of the competent physicians
单项选择题
A．Neighbors should help each other.B．Women should have their own careers.C．Man and wife should share household duties.D．Parents should take good care of their children.
A．Neighbors should help each other.
B．Women should have their own careers.
C．Man and wife should share household duties.
D．Parents should take good care of their children.
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