单项选择题

The fluid remained sterile so long as the flask was maintained in the vertical position. If, however, I contaminated the broth by allowing some of it to flow into the neck and then back into the flask, putrefaction promptly followed. In the context in which it appears, "putrefaction" most nearly means

A. decay.
B. flask.
C. meat.
D. contamination.
E. maintenance.

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单项选择题

Farmers learned that peas and beans were far less vulnerable to the insects, and corn was a more robust grain than wheat. In the context in which it appears, robust most nearly means

A. crude.
B. demanding.
C. productive.
D. vigorous.
E. rich.

单项选择题

A piece of first-year ice will taste salty. Eventually, if the ice survives, these pockets of brine drain out through fine, veinlike channels, and the ice becomes fresher; multiyear ice can even be melted and drunk. In the context in which it appears, fine most nearly means

A. acceptable.
B. elegant.
C. precise.
D. pure.
E. small.

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