The passage mentions all of the following aspects of plankton EXCEPT（）
A. the length of their lives
B. the level of the ocean at which they are found
C. their movement
D. their size
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在对人的正常心理与异常心理进行区分时，统计学标准的局限性是( )。
A. 远离平均数的两端被视为异常
B. 多以心理测验法为工具，获得确定正常与异常的界限
C. 有些心理特征和行为不一定成常态分布
D. 位于平均值的大多数人属于心理正常范围
The word "favored" in line 2 is closest in meaning to（）
A. preferred
B. recommended
C. imported
D. included
Some ecologists believe（）more than 50 percent of existing species will be lost in the next 100 years.
A. because
B. that
C. while there is
D. that there are
The chemical composition of sandstone is the same as（）
A. that of sand
B. that sand is
C. sand is that
D. what of sand
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