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【单选题】
There is no chair for me _______. [ ]A.
to sit
B.
to sit on
C.
sit
D.
sitting on
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【简答题】Algae(水藻) are very plants. They grow in fresh water or salty water. Seaweed is algae that grow in salty water. Seaweed is red or brown in color. The Japanese people use these plants from the se...
【单选题】Historically algae has been used as food for people in coastal populations, but some species of ________ are now being grown commercially for food use. Sushi wrappers may be made from this algae.
A.
green algae
B.
dinoflagellates
C.
red algae
D.
stoneworts
E.
euglenophytes
【单选题】Researchers find it difficult to make algae produce hydrogen efficiently because __________. 查看材料
A.
removing the sulfate slows down hydrogen production
B.
it is hard to create an airfree environment
C.
it is expensive to remove the sulfate from the environment
D.
the algae's cells work slowly if there is no oxygen in the air
【单选题】No unicellular or colonial representatives of the _______________ algae have been found to date.
A.
green algae
B.
diatoms
C.
brown algae
D.
dinoflagellates
E.
euglenoids
【简答题】Algae(水藻) are very plants. They grow in fresh water or salty water. Seaweed is algae that grow in salty water. Most seaweed is red or brown in color. The Japanese people use this plant from th...
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