题目内容

n. two or more things joined or mixed together to form a single unit

A. charity
B. duration
C. conservation
D. combination

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n. the protection of the natural environment; the official protection of buildings that have historical or artistic importance

A. duration
B. conservation
C. dimension
D. disadvantage

adj. easily damaged or broken; not strong and easily becoming ill/sick; small and having a beautiful shape or appearance

A. decent
B. delicate
C. considerate
D. definite

v.to change from a gas into a liquid;

A. digest
B. derive
C. despise
D. condense

v.to give all your attention to sth. and not think about anything else

A. discharge
B. concentrate
C. condense
D. descend