为了防止丢失，旅游者的护照、回乡证和集体签证，在办完手续后，可以保留在导游员手中。 ()
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In hardware, a bug is a recurring【37】problem that prevents a system or set of【38】from working together properly. The【39】of the term reputedly goes back to the early days of computing, when a hardware problem in a computer at Harvard University was【40】to a moth caught between the contacts of a relay in the machine.
(21)
A. wording
B. term
C. diction
D. insect
What is mainly discussed in the text？
A. How to use sunscreen cream better
B. The different opinions on sunscreen cream
Connection between cancer and sunscreen
D. Research on the new functions of sunscreen cream
What can we learn from the first paragraph？
A. Sunscreen cream is essential in people's life.
B. The dermatologists prefer to attribute the skin problems to sunshine.
C. People agree with the dermatologists' opinion on using sunscreen cream.
D. Sunscreen cream actually increases the risk of skin cancer.
Why is the Space Shuttle Columbia special？
A. Because it is not similar to the spaceships of the previous twenty years.
Because it has different designs and is able to return to earth and make further flights.
C. Because it can be used in a variety of ways now.
D. Because it can be used to establish colonies on earth.
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