The author refers to a "conveyer belt" in line 13 in order to ______.
A. describe the complicated motions made possible by back-coupling
B. show how temperature differences depend on the positions of the continents
C. illustrate the effects of convection in the mantle
D. account for the rising currents under certain mid-ocean ridges
查看答案
听力原文：There are not enough cases for so many suits, so we have to rearrange those cases. We can fit one more suit into the case, can't we？
(26)
A. This case can hold more suits than that one.
B. We can't find the other case of suits.
Can this case fit in with the others？
D. Can't we put another suit into the case？
A．A person needs to go back home frequently.B．A person needs adjustment in a new envir
A person needs to go back home frequently.
B. A person needs adjustment in a new environment.
C. A person needs to experience some frustration.
D. A person needs to depend on others.
The passage suggests that the lack of an observed decline in the fecundity of the creeping
A. creeping dogwood is a species that does not resemble other forest plants
B. creeping dogwood is a species pollinated by a broader range of insect species than are most dogwood species
C. creeping dogwood grows primarily in regions that were not sprayed with pesticide, and so served as a control for the experiment
D. creeping dogwood is similar to the red-osier dogwood, but its insect pollinators are known to be insensitive to the pesticide used in the study
A．European meat was kept out of the home markets.B．The mislabeling of food and drugs w
A. European meat was kept out of the home markets.
B. The mislabeling of food and drugs was prevented.
C. A monopoly on food production was broken.
D. New legislation to control food industry was passed.
微信支付 
支付宝支付