题目内容

________a spaceship far out in the solar system, the Earth would appear as a tiny dot.

A. From
B. That
C. When
D. Where

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______the processof photosynthesis, green plants absorb carbon dioxcide and produce oxygen.

A. For
B. Through
C. It is
D. While

________dog was the first animal to be domesticated is generally agreed upon by authorities in the field.

A. Until the
B. That the
C. The
D. It was the

Demand for a consumer product depends on the incomes of buyers, their subjective preferences, and_______.

A. the prices of competing products
B. competing products are priced
C. waht are the competing products' price
D. how high the prices of competing products

If negotiations for the new trade agreements take_____, critical food shortage will develop in several countries.

A. too much longer
B. the longer
C. much too longer
D. the longest

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