A.S+vt.+O
B.S+vt.+O+OC
C.S+vt.+IO+DO
D.S+vi.
第2题
A、Because of the geographical and climatic conditions.
B、Because China have different resources in different regions
C、Because China is a big country with vast territory.
D、Because there are eight cuisines in China.
第3题
A、很容易蒸发
B、很容易爆炸
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