The content are all the same - new questions, except, there is one new reading for me-the agricultural method - fallow and 3 tier cropping system
Also integrated writing: (1) Integrated writing: Passage: bees exist on Earth 200million years ago. 1) the fossilized bees found 200 years ago in State of Arizona 2) Bees feed on flower or flowering plants whereby the flower or flowering plants only exist in 200m year ago
3) lack of spiral structure on the fossilized chamber compared to modern bee nest - this fossilized chamber might be made by other insects
Lecture: bees exist earlier than 200m years ago. 1) Tree resin that produces the subtance to preserve the bees only existed 200m years go. Bees may have been existed earlier before the existence of tree resin.
2) Bees may have been fed on non-flowering plants such as pine trees or firm ??? and gradually evolved to feeding on flower plants.
3)chemical evidence provides that the water proofing (i.e. prevents the water from entering the bee chamber) substance are found in both fossilized and modern bee chambers.
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发表于 2012-10-28 02:58:40
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. Btw, where did you take the test? seems i finished the test earlier than you.
