多选题There are two types of -ing + noun combinations. For one type, the -ing form serves as a modifier of the noun and expresses the purpose of the noun; for instance, dining-room means the room for dining. In such circumstances, the word stress always falls on the ___________ element. A、second B、 first C、either D、 neither简答题__________ stress is the relative degree of force given to a certain syllable in a word of more than one syllable when it is pronounced in isolation, as if quoted from a dictionary. A、Nuclear B、Sentence C、Word D、Tonic简答题__________, on the whole, do not have much effect on the placement of the base or root element. A、Suffixes B、Affixes C、 Prefixes D、Derivation简答题The mistakes of stress are always accompanied by an incorrect intonation, which is a very significant source of error – even for advanced learners. A、正确 B、错误简答题Stressed syllables bear four physiological properties: loudness, vowel duration, pitch and vowel __________. A、intensity B、reduction C、quantity D、quality简答题Word stress is the framework upon which sentence stress and intonation contour is built. A、正确 B、错误简答题Absence of stress on a syllable, or on a word in some cases, is frequently associated in English with vowel __________, the changes that result from unstressed syllables. A、 reduction B、 quality C、 loudness D、 pitch简答题Some words in English are shown in dictionaries as having three levels of stress: primary, secondary, unstressed or weak. A、正确 B、错误简答题In more than three-syllable words, if the primary stress falls on the third syllable or later, the secondary stress are usually marked on one of the preceding syllables, for example, introduction / /ɪntrədʌkʃn/ and education /eʤukeɪʃn/. A、正确 B、错误