50. What is the author's advice to consumers?
A. Follow their intuition in deciding what to eat.
Be doubtful of diet experts' recommendations.
C. Ignore irrelevant information on their news feed.
D. Think twice about new nutrition research findings.
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左右极限都存在但不相等的间断点叫做可去间断点。
A. 对
B. 错
任何初等函数在它的定义区间都是连续的。
A. 对
B. 错
所有基本初等函数在它的定义域内都是连续的。
A. 对
B. 错
若函数f(x)在闭区间[a,b]内连续,且f(a)*f(b)<0,即f(a)与f(b)异号,则在区间(a,b)内至少存在一点c,使f(c)=0
A. 对
B. 错