单项选择题

Since the early 1990s, conservationists have () protecting the Amazon in part because of its abundance of plant and animal species.

A. called forth
B. called back
C. called up
D. called for

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单项选择题
Although he was not caught cheating on the exam, the feeling of guilt () over and over again.

A. ascended
B. conquered
C. secured
D. recurred
单项选择题
Which sport has the most expenses () training equipment, players' personal equipment and uniforms

A. in place of
B. by way of
C. in terms of
D. by means of
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