单项选择题

We all know that in a situation like this a cool head is______

A．called for
B．called off
C．called on
D．called up
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单项选择题
The destruction 'an earthquake causes depends on its ________ and duration, or the amount of shaking that occurs.
A．altitude
B．magnitude
C．multitude
D．aptitude
单项选择题
The El Nino has ______ affected the regional weather and temperature over much of the tropics, sub-tropics and some mid-latitude areas.
A．externally
B．consistently
C．insistently
D．internally
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