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.
<上一题 目录 下一题>
热门 试题

单项选择题
The author mentions all of the following as reasons why plankton could be considered a human food source EXCEPT that it is ________.
A．high in food value
B．in abundant supply in the oceans
C．an appropriate food for other animals
D．free of chemicals and pollutants
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
相关试题