单项选择题

Questions 17-20 are based on the following passage. You now have 20 seconds to read the questions 17-20. What does this speaker mainly talk about

A．Two important tests of a new airliner before it is put into use.
B．How to carry out tank test in the water.
C．How pilots carry out the test flights.
D．How to make a safe passenger plane.

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单项选择题

Where is the second test carried out

A．In the air.
B．On the airfield.
C．Under water.
D．At the plane manufacturing factory.

单项选择题

When-did Ali announce that he had become a Black Muslim

A．He announced that he had become a Black Muslim after defeating Liston in a championship fight.
B．He announced that he had become a Black Muslim while he was still an amateur boxer.
C．He announced that he had become a Black Muslim after the Vietnam War.
D．He announced that he had become a Black Muslim when he retired form boxing in 1980.

Questions 17-20 are based on the following passage. You now have 20 seconds to read the questions 17-20. What does this speaker mainly talk about 您的浏览器不支持 audio 元素。

Questions 17-20 are based on the following passage. You now have 20 seconds to read the questions 17-20. What does this speaker mainly talk about