By mentioning Spencer Rathuss work, the author intends to______.
A. recommend this book to people with great stress
B. manifest his opinion is different from that of Janet DiPietro
C. prove that stress does have positive effect on people
D. demonstrate people"s bias towards stress"s effect
查看答案
The authors attitude towards new technologies is______.
A. skeptical
B. welcoming
C. positive
D. ambivalent
What caused the differences in the density of matter to grow larger?
A. Gravitational attraction.
B. Little differences in the density of matter.
C. The big bang.
D. Massive stars.