单项选择题

What is mentioned as one distinguishing feature of krill

A．They are the smallest marine animals.
B．They are pink in color.
C．They are similar in size to lobsters.
D．They have grass like bodies.
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单项选择题
According to the passage, why is plankton considered to be more valuable than land grasses
A．It is easier to cultivate.
B．It produces move carbohydrates.
C．It does not require soil.
D．It is more palatable.
单项选择题
SATAN, a program designed by Dan Farmer, can be used ________.
A．to investigate the security of Internet sites
B．to improve the security of the Internet system
C．to prevent hackers from breaking into websites
D．to download useful programs and information
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