取供试品0.10g，加无水乙醇5ml溶解后，加二苯胺试液1滴，用硫酸铈滴定液(0.01mol/L)滴定，不得超过1.0mlE．
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All of the following are mentioned in the discussion of lichens EXCEPT ______.
A. They are capable of producing their own food.
B. They require large amounts of minerals lo prosper.
C. They are a union of two separate plants.
D. They can live thousands of years.
The word "them" in line 7 refers to ______.
A. Sumerian, Akkadian, and Babylonian
B. bilingual inscriptions
C. cuneiform. tablets
D. scholars
The word “fortuitous” in line 6 is closet in meaning to ______.
A. important
B. sudden
C. early
D. lucky
Which of file following terms is defined in the passage？
A. anchors (line 6)
B. stagnant (line 7)
C. dew (line 14.)
D. ultraviolet (line 16)
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