What is the main goal of sending human missions to Mars
A. To find out if life ever existed there.
B. To see if humans could survive there.
C. To prove the feasibility of large-scale space ventures.
D. To show the leading role 6f science in space exploration.
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The author's chief argument against high heels is that ______.
A. they pose a threat to lawns
B. they are injurious to women's health
C. they don't necessarily make women beautiful
D. they are ineffective as a weapon of defense
The passage tells us that proof of life on Mars would ______.
A. make clear the complex chemistry in the development of life
B. confirm the suggestion that bacterial fossils travelled to Earth on a meteorite
C. reveal the kind of conditions under which life originates
D. provide an explanation why life is common in the universe
当PC机I/O 扩充槽送出检查出错信号时，一般向CPU发出( )请求处理。
A. 可屏幕中断(INT信号
B. 不可屏蔽中断(MN信号
C. 软件中断
D. 停机信号
将二进制数101101101.111101转换成十六进制数为( )。
A. 16F8
B. 16F4
C. 16F5
D. 16F3
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