It is caused by many different species of fungi and infects plants display white powdery spots on the leaves and stems.
A、sunscald
B、gall
C、wilt
D、powdery mildew
E、rot
A、sunscald
B、gall
C、wilt
D、powdery mildew
E、rot
Air pollution, together with overpopulation, ______ many problems in big cities today.
A.are causing -
B.is causing
C.are caused
D.is caused
A.mainly
B.partly
C.in some way
D.in no way
Physical fatigue is usually caused by ______.
A.transmittable diseases
B.too many stimulants
C.lack of physical exercise
D.excess wastes in the bloodstream
A.One.
B.Two.
C.Three.
D.Four.
-The drunk driver wishes he()so many injuries in the accident.
-But he().
A. hadn't caused; had B.didn't cause; did
C. hasn't caused; did
D.hasn't caused; has
It is proved that the uncontrolled activity of free radicals caused many cancers.
A.Y
B.N
C.NG
According to the author, many sleeping disorders are caused by______.
A.other diseases
B.pre-bedtime exercises
C.improper sleep
D.chronic fatigue syndrome
The process of urbanization has caused many problems, the major one is ______.
A.economy
B.the growth of poverty in cities
C.education
D.health care
A.Rejection
B.Transplantation
C.Antibody
D.Dementia
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