Problem: This radioactive heavier isotope can be new ( stable or unstable ) depending on the chemical element involved .
This heavier radioactive isotope may be new depending on the chemical element ( stable or unstable ) .
OPTIONS:
- no
- yes
-+-
A: yes

The advent of vocal percussion added new dimensions to the a cappella genre and has spread very widely in modern arrangements .
The advent of modern percussion added new dimensions to the a cappella genre and has become very prevalent in vocal arrangements .

Are these two sentences paraphrases of each other? OPTIONS:
- no
- yes
no

1. Some HTC systems , such as HTCondor and PBS , may run tasks on opportunistic resources .
2. Some PBS systems , such as HTCondor and HTC , can run tasks on opportunistic resources .
OPTIONS:
- no
- yes

no

A same meaning or not problem: OPTIONS:
- no
- yes
An experiment was conducted in 1919 , where a standardization method of testing was tried .
An experiment was done in 1919 where a standardization method of testing was tried .
****
[A]: yes

Same meaning?
The first day is the last day of the year .
The last day is the first day of the old year .

OPTIONS:
- no
- yes

Answer: no

Same meaning?
Serena soon found out that Blair had slept with her boyfriend , Nate Achirawat , the night of her disappearance .
Serena soon finds out that Blair had slept with her boyfriend , Nate Achirawat , the night of her disappearance .

OPTIONS:
- no
- yes

Answer:
yes