单项选择题

What is the main subject of the passage

A．Experiments are done to study tomatoes.
B．Tomatoes are delicious food.
C．Many people love eating tomatoes.
D．Eating tomatoes can lower the risk of cancer.

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单项选择题

A．valuableB．appropriateC．convenientD．favorite

A．valuable
B．appropriate
C．convenient
D．favorite

单项选择题

People should ______ when deciding wheher to have a negative rich environment.

A．note their own reactions
B．move to a healthier area
C．observe domestic animals
D．watch how wealthy people behave