单项选择题

The air-conditioner is so energy-efficient that it can save thousands of dollars a year in electricity bill alone.

A.这台空调是如此的高效能，以致一年的电表账单仅需支付几千美元。
B.这台空调仅电费一项一年就能节省数千美元，很高效。
C.这台空气调节器是如此的高效，以致一年就独自节省电费数千美元。
D.这台空调是如此的高效能，以致仅电费一项，一年就能节省数千美元。
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单项选择题
During the 16th century, what happened in the area that is now Mexico
A. The native people lost their independence.
B. The Spanish adopted the local cuisine.
C. The farmers began to raise other crops.
D. The Indians began to trade with Spain.
单项选择题
People are likely to buy the product sold in a glass or dish because ______ .
A．they have no other choice
B．they think they can get the container for free
C．the container is too attractive
D．they believe the cost of the container is included in the cost of the product
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