What did scientists learn about earthquakes at the Rocky Mountain Arsenal?

A．) They occur at about 4,000 metres below ground level.

B．) The injection of water into earthquake faults prevents earthquakes from occurring.

C．) They are usually caused by the oil in the faults.

D．) Harmful earthquakes earl be possibly prevented by causing small, harmless earthquakes.

[单选题]What did Henry learn from the newspaper that day? （ ）A．A valuable suitcase was missing．B．A man stole money from a bank．C．A woman ran away from home．

[单选题]What did Henry learn from the newspaper that day?A．A valuable suitcase was missing.B．A man stole money from a bank.C．A woman ran away from home.

[单选题]What did Henry learn from the newspaper that day ?A． A valuable suitcase was missing .B． A man stole money from a bank .C． A woman ran away from home

[单选题]What did Henry learn from the newspaper that day?A．A valuable suitcase was missing.B．A man stole money from a bank.C．A woman ran away from home.

[单选题]What did the scientists do to find out if the e-nose worked?A． They presented it with all common crops..B． They fixed 13 sensors inside the device.C． They collected different damaged leaves.D． They made tests on damaged and healthy leaves.

[主观题]What did you learn from your internships or work study experiences?

[单选题]What can we learn about Fight It?A． It helps the diabetics in financial difficulties.B． It organizes parties for volunteer once a year.C． It offers less expensive medicine to diabetics.D． It owns a well-known medical website.

[单选题]What can we learn about “Versed”?A． It consists of three parts.B． It is mainly about the American army.C． It is a book published two decades ago.D． It partly concerns the poet’s own life.

[单选题]23． What did Jackie Chan learn in the China Drama Academy? 'A． SingingB． Dancing．C． Kong Fu and stunts． D． Dramas．

[单选题]The scientists are ____ a series of experiments to learn more about how the