皮皮学，免费搜题
登录
搜题
【单选题】
The presence of microorganisms that produce a toxin causes seawater to turn brownish red, a phenomenon known as a red tide. Sea otters do not feed in areas where clams, their main source of food, have become contaminated with this toxin. According to a proposed explanation of the otters behavior, the otters sample the clams in a potential feeding area and can taste any toxin in them. Which of the following, if true, would most strongly indicate that the hypothesis described in the last sentence of the passage is not correct?A.
In some of the areas where red tides occur, neither clams nor sea otters are indigenous species.
B.
The presence of sea otters in a given area has a significant effect on which other marine organisms are to be found in that area.
C.
When seawater in an area unaffected by red tide is artificially dyed brownish red, sea otters do not feed on the clams in that area.
D.
If the clams in a given area are contaminated with toxins, sea otters move to other areas in search of food.
E.
Although very small amounts of the toxin produced during a red tide are not harmful, large doses can be fatal to animals the size of sea otters.
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】How many hours are there in this course?
A.
64 hours
B.
60 hours
C.
80 hours
D.
72 hours
【简答题】How many hours of operation are there every day? __________________.
【单选题】—________ hours of sports do you do every week? —Six hours.
A.
How long
B.
How soon
C.
How much
D.
How many
【判断题】主要产品单位成本表中的上年实际平均单位成本、本年计划单位成本、本月实际单位成本和本年累计实际平均单位成本，应该与按产品品种反映的产品生产成本表中相同品种、相应项目的指标相符。( )
A.
正确
B.
错误
【单选题】How many hours of sleep are the healthiest for most people?
A.
At least eight hours.
B.
Around seven hours.
C.
As many as you need.
D.
Less than seven hours.
【简答题】膳食中饱和脂肪酸、单不饱和脂肪酸和多不饱和脂肪酸在膳食中的比例应该为____。
【单选题】片剂制备过程中,挥发油的加入方法错误的是
A.
加入从干颗粒中筛出的细颗粒中
B.
将挥发油微囊化
C.
将挥发油制成β-CD包合物
D.
用少量乙醇溶解后喷雾于颗粒上
E.
将挥发油溶解于黏合剂中制粒
【单选题】下列关于片剂制备中挥发油的加入方法叙述错误的为
A.
可加入从干颗粒中筛出的细颗粒中
B.
可溶解于粘合剂中后制粒
C.
可将挥发油微囊化
D.
将挥发油制成β-CD包合物
E.
可用少量乙醇溶解后喷雾在颗粒上
【单选题】膳食中饱和脂肪酸、单不饱和脂肪酸和多不饱和脂肪酸的适宜比例应为（ ）
A.
1 ∶ 1 ∶ 1
B.
1 ∶ 1 ∶ 2
C.
1 ∶ 2 ∶ 2
D.
1 ∶ 2 ∶ 1
相关题目：
参考解析：
知识点：
题目纠错 0
发布
