单项选择题

During the process, great care has to be taken to protect the （） silk from damage.

A．sensitive
B．tender
C．delicate
D．sensible

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单项选择题
The energy （） by the chain reaction is transformed into heat.

A．transferred
B．released
C．delivered
D．conveyed
单项选择题
Investigators agreed that passengers on the airliner （） at the very moment of the crash.

A．should have died
B．must be dying
C．must have died
D．ought to die
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