托福
课程： A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
- rabbit
- raccoon
- race
- racetrack
- racial
- radar
- radial
- radiant
- radiate
- radiation
- radiator
- radical
- radically
- radio
- radioactive
- radioactivity
- radiocarbon
- radiometric
- radish
- radium
- radius
- raft
- rag
- rage
- ragtime
- rail
- railhead
- railroad
- railway
- rain
- rainbow
- raindrop
- rainer
- rainfall
- rainforest
- rainwater
- rainy
- raise
- rake
- rally
- ramble
- rampant
- ranch
- rancher
- rancho
- random
- randomly
- range
- rank
- rape
- rapid
- rapidity
- rapidly
- rapport
- rare
- rarefy
- rarer
- rarity
- rat
- ratchet
- ratify
- ratio
- ration
- rational
- rationale
- rationalism
- rationally
- rattle
- rattlesnake
- ravage
- raven
- ravine
- raw
- rawhide
- ray
- rayon
- reabsorb
- reach
- reachable
- react
- reaction
- reactive
- read
- readership
- readily
- readjust
- ready
- real
- realism
- realist
- realistic
- realistically
- reality
- realization
- realize
- realm
- reap
- reaper
- reappear
- rear
- rearrange
- reason
- reasonable
- reasonably
- reaumur
- rebel
- rebellion
- rebellious
- rebirth
- rebound
- rebuild
- recall
- recede
- receive
- receiver
- recent
- receptacle
- reception
- receptive
- receptiveness
- receptor
- recess
- recharge
- recipe
- recipient
- reciprocate
- recital
- reckless
- reckon
- reclaim
- reclamation
- recognition
- recognizable
- recognize
- recoil
- recommend
- recommendation
- reconstitute
- reconstruct
- reconstruction
- recorder
- recount
- recover
- recovery
- recreate
- recreation
- recreational
- recruit
- recruitment
- recrystallize
- rectangle
- rectangular
- rectify
- recur
- recurrence
- recurrent
- recycle
- red
- redbud
- reddish
- redefine
- redesign
- rediscover
- reduce
- reduction
- redwing
- redwood
- reed
- reef
- reel
- reelect
- reelection
- reenter
- reexamine
- referee
- reference
- referent
- refill
- refine
- refinement
- refiner
- refinery
- reflect
- reflection
- reflective
- reflectivity
- reform
- reformer
- refractory
- refreeze
- refresh
- refreshment
- refrigerate
- refrigeration
- refrigerator
- refuge
- refurbish
- refuse
- refute
- regain
- regard
- regardless
- regenerate
- regeneration
- regime
- regiment
- regimentation
- regional
- regionalist
- regionalization
- register
- regolith
- regret
- regrettable
- regular
- regularity
- regularize
- regulate
- regulation
- regulator
- regulatory
- regurgitate
- rehabilitate
- rehabilitation
- reheat
- rehydrate
- reign
- reindeer
- reinforce
- reinterpretation
- reject
- rejection
- rejoin
- relate
- relation
- relational
- relative
- relax
- relaxation
- relay
- release
- relevance
- relevant
- reliability
- reliable
- reliance
- reliant
- relic
- relict
- relief
- relieve
- religion
- religious
- religiously
- relocate
- reluctance
- reluctant
- reluctantly
- rely
- remainder
- remark
- remarkable
- remarkably
- remediation
- remember
- remind
- reminder
- remnant
- remodel
- remote
- removal
- remove
- remuneration
- renaissance
- rename
- rend
- render
- renew
- renewable
- renewal
- rennin
- renounce
- renowned
- rent
- rentable
- rental
- renter
- renunciation
- reopen
- reorganize
- reorient
- repair
- repay
- repeat
- repeatedly
- repel
- repertoire
- repertory
- repetition
- repetitive
- rephrase
- replace
- replacement
- replant
- replenish
- replenishment
- replica
- replicate
- reply
- report
- reportedly
- represent
- representation
- representative
- repress
- repression
- reprieve
- reprint
- reproduce
- reproduction
- reproductive
- reptile
- reptilian
- republic
- republican
- republish
- repudiate
- reputation
- repute
- request
- requirement
- requisition
- reradiate
- resale
- rescue
- researcher
- resemblance
- resemble
- resent
- resentment
- reserve
- reservoir
- reset
- resettle
- reshape
- reside
- residence
- residency
- resident
- residential
- residual
- residue
- resilience
- resilient
- resin
- resist
- resistance
- resistant
- resolution
- resolve
- resonance
- resonator
- resort
- resource
- resourcefulness
- respect
- respectable
- respective
- respectively
- respiration
- respond
- respondent
- response
- responsibility
- responsible
- responsive
- responsiveness
- rest
- restatement
- restaurant
- restful
- restless
- restlessness
- restoration
- restore
- restrain
- restraint
- restrict
- restriction
- restrictive
- resume
- retail
- retailer
- retain
- retard
- retentive
- retire
- retirement
- retool
- retract
- retrain
- retreat
- retrieval
- retrieve
- retrospect
- return
- reunion
- reuse
- reveal
- revealingly
- revenue
- revere
- reverently
- reversal
- reverse
- revert
- review
- reviewer
- revise
- revision
- revitalization
- revitalize
- revival
- revive
- revolt
- revolution
- revolutionary
- revolve
- reward
- rewrite
- Reykjavik
- rhetoric
- rhetorical
- rhinoceros
- rhyolite
- rhythm
- rhythmic
- rhythmical
- rhythmically
- rib
- ribbon
- rice
- rich
- richly
- richness
- rid
- ride
- rider
- ridge
- ridicule
- ridiculous
- rift
- right
- rigid
- rigidity
- rigidly
- rigor
- rigorously
- rim
- rime
- ring
- rise
- risk
- risky
- rite
- ritual
- ritualize
- rival
- rivalry
- riverbank
- riverbed
- rivet
- road
- roadbed
- roadway
- roam
- roar
- rob
- robin
- robust
- rocket
- rocky
- rod
- rodent
- rodeo
- roe
- role
- roll
- roller
- roman
- romance
- romancer
- romanize
- romantic
- romantically
- romanticism
- romanticize
- Rome
- roof
- rooftop
- rook
- room
- roost
- rooster
- root
- rootless
- rope
- rosy
- rot
- rotary
- rotate
- rotation
- rote
- rough
- rougher
- roughness
- round
- route
- routine
- routinely
- row
- royal
- royalty
- rub
- rubble
- rudimentary
- rugged
- ruin
- rule
- ruler
- rumble
- rumen
- ruminant
- ruminate
- rumor
- run
- runoff
- runway
- rupture
- rural
- rush
- Russia
- Russian
- rust
- rustproof
- rut
- ruthlessly
- rye
