单项选择题

According to the speaker, what do people often think about astronomers

A．They spend most of their time looking through telescopes.
B．They are constantly analyzing data.
C．They often live near observatories.
D．They devote a lot of time to theoretical problems.

<上一题目录下一题>

热门试题

单项选择题

Why do astronomers often use photographic plates

A．To decrease the time it takes to photograph objects.
B．To avoid using a telescope.
C．To sharpen the color of what they observe.
D．To obtain images of distant objects.

单项选择题

What recommendation does the professor make about volume

A．Always use a microphone.
B．Avoid large rooms.
C．Never vary the volume.
D．Not to shout.