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【单选题】
DVD采用的视频编码标准是A.
MPEG-l
B.
MPEG-2
C.
MPEG-4
D.
MPEG-7
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举一反三
【单选题】Why does the author mention fresh coffee in Paragraph 2?
A.
As an example of complex substances having not been duplicated satisfactorily.
B.
Because the coffee fragrance is hard to produce.
C.
To conclude the passage.
D.
The smell of fresh coffee is inviting.
【简答题】听力原文： We live in a society in which the medicinal and social use of substances is pervasive: an aspirin to quiet a headache, some wine to be sociable, coffee to refresh oneself in the morning. When do...
【简答题】安全评价，国外也称为风险评价或危险评价，它是以实现（ ）的安全为目的，应用安全系统工程的原理和方法，对工程和系统中存在的危险及有害因素等进行识别与分析，判断工程和系统发生事故和职业危害的可能性及及其严重程度，提出安全对策及建议，制定防范措施和管理决策的过程。
【简答题】安全评价也称( ),是以实现系统安全为目的
【单选题】. It is far better for one to drink milk, ________ one gets healthful nutrients, than to drink coffee, ________ contains harmful substances.
A.
what, what
B.
where, which
C.
from which, which
D.
in which, what
【简答题】Substances in coffee can ______ _______ iron being absorbed into the body.
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