_______________ (出现了很多困难) as a result of the change over to a new type of fuel.

A．new radio devices should be developed for tracking the endangered blue whales
B．blue whales are no longer endangered with the use of the new listening system
C．opinions differ as to whether civilian scientists should be allowed to use military technology
D．military technology has great potential in civilian use

A．The defendants will confess to the crime as long as their fingerprints are detected at the crime scenes.
B．Even the fingerprints of someone were found at the crime scenes, they sometimes can’’t serve as the decisive evidence.
C．The high-tech will help the experts to determine the how long the fingerprints had been left.
D．The scene of the crime needs to be examined carefully.