By saying "With Mars the scientific stakes are arguably higher than they have ever been" in the fourth paragraph, the author means that ______.
A. with Mars the risks involved are much greater than any previous space ventures
B. in the ease of Mars, the rewards of scientific exploration can be very high
C. in the case of Mars, much more research funds are needed than ever before
D. with Mars, scientists argue, the fundamental interests of science are at issue
查看答案
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.
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
微信支付 
支付宝支付