[单项选择]The Greeks call sharks "hounds of the sea" because____________.
A. they can follow a scent just like dogs
B. they can move swiftly under the sea
C. they are hostile to divers
D. they have very strong basic instincts

[单项选择]The Greeks call sharks "hounds of the sea" because ______.


A. they can follow a scent just like clogs
B. they can move swiftly under the sea
C. they are hostile to divers
D. they have very strong basic instincts

[单项选择]Many sharks fish and other sea animals.
A. live with
B. depend in
C. feed on
D. eat at

[单项选择]Why sharks are useful for humans


A. Their tasty meat.
B. The principle of their defense system against disease.
C. Their solid skin.
D. The principle of their birth modes.

[单项选择]How can sharks find their quarries


A. By good sense of water waves made by quarries.
B. By good sense of smell and electrical magnetic power.
C. By good sense of light.
D. By good sense of blood.

[单项选择]Why are sharks useful for humans


A. For their tasty meat.
B. For the principle of their defense system against disease.
C. For their solid skin.
D. For the principle of their birth modes.

[单项选择]

Sharks have gained an unfair reputation for being fierce predators of large sea animals. Humanity’s unfounded fear and hatred of these ancient creatures is leading to a worldwide slaughter that may result in the extinction of many coastal shark species. The shark is the victim of a warped attitude of wildlife protection; we strive only to protect the beautiful, nonthreatening parts of our environment. And, in our efforts to restore only nonthreatening parts of our earth, we ignore other important parts.
A perfect illustration of this attitude is the contrasting attitude toward another large sea animal, the dolphin. During the 1980s, environmentalists in the United States protested the use of driftnets for tuna fishing in the Pacific Ocean since these nets also caught dolphins. The environmentalists generated enough political and economic pressure to prevent tuna companies from buying tuna that had been caught in driftnets. In contrast to this effort on behalf of the
A. People have the same attitude toward the large sea animals.
B. Shark's population has increased quickly.
C. Sharks are not extremely efficient animals.
D. Sharks need immediately considering protection for their survival.