Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions

[CR][bats sound] HSPA posts

Expert replies
by HSPA » Sun Apr 17, 2011 3:56 am
Bats emit sounds and generally use the echoes of these sounds highly efficently to detect, locate and catch their preys. However, it is claimed that the characteristic efficiency of this process is reduced by moths able to hear the sounds emitted by insect-eating bats.
Which of the following statements if true, best supports the claim above?
A. Those moths cannot hear the sounds emitted by insect-eating bats live longer on the average than those that can hear such sounds when both kinds of moth are in an environment continuously free of such bats.

B. Those moths that cannot hear the sounds emitted by insect-eating bats are among the species of insects that are most liekly to be caught by such bats.

C. When a moth changes its speed or direction of flight, there is a change in the sound pattern generated by the moth's wing movements.

D. Moth species that can hear the sounds emitted by insect-eating bats are less-likely to be caught by such bats than are moths species that cannot hear these sounds.

E. Moths that are capable of hearing the sounds emitted by insect-eating bats differ in their abilities to use evasive action to escape capture by such bats.
First take: 640 (50M, 27V) - RC needs 300% improvement
Second take: coming soon..
Regards,
HSPA.
Join the discussion
Source: — Critical Reasoning |

by rohu27 » Sun Apr 17, 2011 6:04 am
is it D?
as it gives an edge to moths which can hear bat's sound.
was confused between D vs E but E just says they use evasive action, but no proof tht action will be successful -wht if they are still cuaght by the bats?
so going for D.
Join the discussion

by aspirant2011 » Sun Apr 17, 2011 9:43 am
Bats emit sounds and generally use the echoes of these sounds highly efficently to detect, locate and catch their preys. However, it is claimed that the characteristic efficiency of this process is reduced by moths able to hear the sounds emitted by insect-eating bats.
Which of the following statements if true, best supports the claim above?

A. Those moths cannot hear the sounds emitted by insect-eating bats live longer on the average than those that can hear such sounds when both kinds of moth are in an environment continuously free of such bats. ---------> goes opposite to the claim

B. Those moths that cannot hear the sounds emitted by insect-eating bats are among the species of insects that are most liekly to be caught by such bats.-------> we dont need to talk about other species

C. When a moth changes its speed or direction of flight, there is a change in the sound pattern generated by the moth's wing movements. ---------> we are not concerned about the wing movements and direction of flight

D. Moth species that can hear the sounds emitted by insect-eating bats are less-likely to be caught by such bats than are moths species that cannot hear these sounds.

E. Moths that are capable of hearing the sounds emitted by insect-eating bats differ in their abilities to use evasive action to escape capture by such bats.---------> no need to discuss about abilities as it is out of scope

whats the OA??????
Join the discussion

by vidhya16 » Sun Apr 17, 2011 11:01 am
IMO - D
Join the discussion

by HSPA » Sun Apr 17, 2011 5:48 pm
OA is D
First take: 640 (50M, 27V) - RC needs 300% improvement
Second take: coming soon..
Regards,
HSPA.
Join the discussion