The five questions were not well designed．,Not all the -找考题网

单项选择题

A．The five questions were not well designed.
B．Not all the questionnaires were returned.
C．Only a small number of students were surveyed.
D．Some of the answers to the questionnaire were not valid.

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单项选择题

A．$250.B．$450.C．$550.D．$125.

A．$250.
B．$450.
C．$550.
D．$125.

单项选择题

A．It served as a fertilizer for crops.B．It formed a new mountain.C．It stabilized air temperatures.D．It destroyed various insect pests.

A．It served as a fertilizer for crops.
B．It formed a new mountain.
C．It stabilized air temperatures.
D．It destroyed various insect pests.

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