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题库 / Prep2007E1-SC-24
Employment costs rose 2.8 percent in the 12 months that ended in September, slightly less than they did in the year that ended in the previous quarter.
less than they did
less than it did
less than they were
lower than
lower than they were
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"lower" cannot be used with countable things.
in general, i can only think of three types of nouns for which you can use "lower" as a quantifier:
1）mathematical quantities (things that can be represented by actual numbers)
2） abstract ideas that aren't necessarily numbers, but that can be thought of as somewhat quantitative
3） things that are literally (= physically) lower than other things
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