单项选择题

The WHO has warned that______.

A．the skies over Mozambique have been too busy
B．malaria has risen sharply
C．medical services have not been available
D．medical staff is not enough
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单项选择题
Which of the following statements concerning Agent Orange is NOT true
A．It was used to kill plants.
B．It was blamed for causing cancer.
C．It’ s a kind of chemical weapon.
D．It’ s widely used in Vietnam by US forces.
单项选择题
A．beingB．areC．wereD．be
A．being
B．are
C．were
D．be
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