According to the passage, who owned receivers in the early days of radio？A．Military commun

Where did De Forest begin regular radio broadcasts?

A．In Massachusetts.

B．On ships.

C．In New York.

D．On ships in New York harbor.

When was the first actual radio broadcast made?

A．On Christmas Eve of 1906.

B．On Christmas Eve of 1960.

C．On Christmas Eve of 1895.

D．On Christmas Eve of 1859.

According to the passage, what were the beliefs of the Greek philosophers based upon?

A．How the natural world was described in Greek mythology.

B．What they observed directly.

C．The writings of philosophers from other societies.

D．Measurements made with scientific instruments.

In the speakers opinion, learning does NOT include______.

A．participating in new assignments

B．developing new skills

C．renewing skills

D．going to the right school

The speaker tells the students that they are not likely to succeed if they______.

A．are too selfish

B．do everything as others do

C．are not greedy enough

D．don"t get a right degree

Which group disagree with the new theory described in the conversation?

A．Biologists.

B．Geologists.

C．Oceanographers.

D．Astronomers.

According to the new theory, where did ocean water come?

A．From disintegrating comets.

B．From gases in the atmosphere.

C．From underground water that rose to the surface.

D．From water vapor.

What are speakers mainly discussing?

A．The effect of the atmosphere on rainfall.

B．How conditions on Earth support life.

C．How water originated on Earth.

D．A new estimate of the age of Earth.

What does the man say about the criticism of technology?

A．We should ignore the criticism.

B．We need to consider what technology may bring to us.

C．He feels bad about the criticism.

D．He thinks the criticism is far-fetched.

What happened after the man built his first computer?

A．He turned to become an enthusiastic reader.

B．He went on to build a machine for his Junior High School.

C．He became obsessed with computer engineering.

D．He was brushed by a hook.