What is the passage mainly about?
A.Ozone's usefulness.
B.Ozone's harmfulness.
C.Ozone's protection.
D.Ozone.
"Managed trade" in the last Sentence probably means ______.
A.market management
B.trade protectionism
C.trade concession
D.market priority
A.They are like grown-up children.
B.They feel very insecure.
C.They long for being protected.
D.They feel extremely lonely.
A great deal has been done to remedy the situation.
A. maintain
B. improve
C. assess
D. protect
15 A great deal has been done to remedy the situation
A maintain B improve
C preserve D protect
In the old days, many women remained childless _________ .
[ A] as a quiet form. of protest
[ B] because of lack of support
[ C] because of unfortunate circumstances
[ D] because they lacked social responsibility
Which statement is false concerning the objectives of applying coupling agent onto fiber?
A.To protect the fiber surface from damage and bind fibers together for ease of processing.
B.To lubricate the fibers for less abrasion during subsequent processing operations.
C.To impart thermal and electric conductivity.
D.To provide a chemicallink between the fiber surface and the matrix and improve the bonding at the interface.
Which statement is NOT true according to the last paragraph?
A.Sprinklers were used to protect citrus trees from being damaged.
B.Citrus trees would be damaged if the temperature drops below minus 2℃ for four hours.
C.The Carolinas, Tennessee and parts of Virginia were covered with snow.
D.Florida Citrus Mutual sprayed trees with sprinklers for citrus growers.