单项选择题

Since these years, American adults have improved the most in ______.

A．performing math problems
B．finding information in a book
C．answering questions involved numbers
D．comparing two different newspaper commentaries
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单项选择题
What is the main idea of the article
A．Plants that absorb metals are being studied by scientists.
B．Scientists are trying to create cancer-fighting crops.
C．Some wild plants can store micronutrients naturally.
D．Anti-cancer products in the foods are good to people's diet.
单项选择题
In many developing countries, people fall sick because ______.
A．they don't absorb enough micronutrients from their diet
B．they don't have plants that take up metal in their tissues
C．there is no locoweed in their countries
D．there is no iron and zinc containing in their food
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