AAlthough pearls may be formed by any shelled mollusk, the most valuable pearls

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问题 AAlthough pearls may be formed by any shelled mollusk, the most valuable pearls are obtained Bfrom the oysters. Except for Cimitation pearls, which are entirely man-made, all pearls are formed from a secretion around an irritating body that enters the soft tissue of a mollusk. DIf the irritating body enters the mollusk by accident, a natural pearl forms.

选项 A、
B、
C、
D、

答案 B

解析 B项oysters为名词复数，表泛指，前面不应加定冠词the，因此应将from the oysters改为from oysters。

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AAlthough pearls may be formed by any shelled mollusk, the most valuable pearls

Manypeopleproposedthatanationalcommitteebeformedtodiscuss______toex

Ifindthistreatmentvery______tomyhealth.A、advisableB、invaluableC、benefic

Arguingaboutdetails______manyhoursofthecommittee’svaluabletime.A、absorbe

TheNational______containsmanyvaluablepictures.A、ExhibitionB、StadiumC、Sho

Theyare______toindustrialists,whoneedthevaluablecopperandnickelinthe

Youradvicewouldbe______valuabletohim,whoisatpresentathiswit’sendA、e

Writtentobeperformedona______,ThorntonWilder’splayOurTowndepictslife

Thedoctorinformedhispatientthatthedrugwasvery______andcanhaveunpleas

Ideas______fromone’sownexperiencearesometimesmorevaluablethanthosefrom

Myworkisnotveryprofitable______money,butI’mgettingvaluableexperienceo

They(forbid)______fromenteringthenewbuildingbecausetheymadesuchadamag

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