This growth, _________ mainly in Southeast Asia and Africa, has dramatic consequences.
A.happens
B.which is happening
C.which happening
D.which happened
A.happens
B.which is happening
C.which happening
D.which happened
A.in case of
B.in view of
C.in face of
D.in excess of
Which of the following is a good gauge of economic progress?
A.the growth rate of real GDP per person, but not the level of real GDP per person
B.the level of real GDP per person and the growth rate of real GDP per person
C.neither the level nor the growth rate of real GDP per person
D.the level of real GDP per person, but not the growth rate of real GDP per person
试解释术语接触抑制(contact inhibition)以及目前更常用的密度制约生长(densitydependent growth)。
A.repatterning of existing cells without a requirement for new growth, as occurs in Hydra
B.repatterning of existing cells without a requirement for new growth, as occurs in newts
C.the reinitiation of division in existing cells and new growth, followed by patterning, as occurs in newts
D.the reinitiation of division in existing cells and new growth, followed by patterning, as occurs in Hydra
A.to
B.on
C.over
D.up
A. As a result
B. By all means
C. In contrast
D. On the contrary
A.more efforts shouldBe made to improve the quality of our material life
B.the fixed supply of natural resources marks a pointBeyond which economicgrowth cannot continue
C.the world population is ever increasing
D.our natural surroundings are inDanger ofBeingDestroyedBy industry