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.
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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
单项选择题
The author's attitude toward SATAN is ________.
A．enthusiastic
B．critical
C．positive
D．indifferent
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