单项选择题

The reason why the laser beam is very strong is that ______.

A．it is artificially illuminated (照亮)
B．it is made up of a concentrated beam of light
C．it sends out heat in all directions
D．its heat is increased by the heat of the sun

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热门试题

单项选择题

Which of the following is the main point of the passage

A．Culture shock on friendship.
B．Americans' friendship.
C．Difference between American and Chinese friendship.
D．Similarity of American friendship to Chinese friendship.

单项选择题

In which of the following situation can the Chinese hardly understand Americans

A．Americans are ready to share their home life with foreigners.
B．Though Americans are very friendly and hospitable, they are reluctant to spend too much time with visitors.
C．Friendships between Americans are close but short.
D．Americans would like to include foreigners in their private lives.