单项选择题

A．learns
B．realizes
C．studies
D．understands
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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
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.
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