Why does the author mention "planktonburgers" in paragraph 3?
A. To describe the appearance of one type of plankton.
B. To illustrate how much plankton a whale consumes.
C. To suggest plankton as a possible food source.
D. To compare food values of beef and plankton.
查看答案
【B11】
A. have
B. as
C. in
D. on
The underlined word "heritage" in paragraph 1 is closest in meaning to ______.
A. history
B. civilization
C. tradition
D. feature
【B13】
A. born
B. given
C. having
D. covered
听力原文:What are the effects caused by tiredness in workers?
(31)
A. Having more accidents.
B. Losing mental and physical abilities.
C. Spending more time working.
D. Needing more education and training.