1. Biochemists use fireflies to study bioluminescence, ________ .
A. the heatless light given off by certain plants and animals.
B. of which is given off the heatless light by certain plants and animals.
2. How high an average __________?
A. must a fellowship student maintain
B. maintains a fellowship student
3. I believe _______ very largely due to mistaken views of the world.
A. this unhappiness are
B. this unhappiness to be
請問為什麼答案會是 1.A 2.A 3.B
謝謝
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