Alllivingorganisms,regardlessoftheiruniqueidentity,havecertainbiological,chemical,andphysicalcharacteristicsincommon.

• A.asaresultof
• B.considering
• C.cognizantof(consciousof,awareof)
• D.whatever

Despitetheproliferationofotherfastermodesoftransportation,therailroadsremainthelargestcarriersofintercityfreightintheUnitedStates.

• A.schemes
• B.means
• C.tracks
• D.variables

ThefirstimportantexpositionintheUnitedStateswasheldinPhiladelphiain1876.

• A.exhibition
• B.concert
• C.excursion
• D.contest

Thedoctorshareshisphonenumberwiththepatients__________theyneedmedicalassistance.

• A.ifonly
• B.asif
• C.eventhough
• D.incase

Thefearofsmallpox,whichterrorizedtheeighteenthcentury,hasnoanalogy(likeness)today.

• A.occurrence
• B.remnants残留物
• C.witnesses
• D.parallel

Wehaveenteredintoanage_______dreamshavethebestchanceofcomingtrue.

• A.which
• B.what
• C.when
• D.that