20、 Unpredictable temperatures, short growing seasons, and heavy snows prevent _____ at high elevations. (A) grow trees (B) the growth of trees (C) trees are growing (D) and growth of trees

8、 The latest prediction for the earthquake is that the solar tides trigger the occurrence of the big earthquakes. The evidence based on the historical account is _____. It is supported by the correlation of the full moon and huge tides in the documented catastrophes. (A) exquisite (B) suspicious (C) compelling (D) paradoxical

20、 Unpredictable temperatures, short growing seasons, and heavy snows prevent _____ at high elevations.
(A) grow trees
(B) the growth of trees
(C) trees are growing
(D) and growth of trees

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