Question 1
Which happened earlier?
A
First human heart-lung machine used successfully
✓ Earlier
B
First heart transplant performed
First human heart-lung machine used successfully (6 May 1953)
came before
First heart transplant performed (3 December 1967)
Question 2
Which happened earlier?
A
Treaty of Versailles signed
✓ Earlier
B
Discovery of King Tut's tomb
Treaty of Versailles signed (28 June 1919)
came before
Discovery of King Tut's tomb (4 November 1922)
Question 3
Which happened earlier?
A
Suez Crisis begins
✓ Earlier
B
Cuban Missile Crisis begins
Suez Crisis begins (29 October 1956)
came before
Cuban Missile Crisis begins (16 October 1962)