13. $\qquad$ is the first manned spacecraft of the Soviet Union, and also the first spacecraft in the world to send a human into outer space. It was launched on April 12, 1961, completing the world's first manned space flight, realizing humanity's dream of entering space. On April 7, 2011, the United Nations General Assembly adopted a resolution to designate April 12th of each year as “International Day of Human Space Flight”.
A. "Vostok 2"
B. "Vostok 11"
C. "Vostok 1"
D. "Vostok 3"
【Answer】C
【Analysis】Vostok was the earliest manned spacecraft series of the Soviet Union and also the world's first manned spacecraft. The Vostok manned space project began in the late 1950s. Before manned flights, a total of 5 unmanned test spacecraft were launched. From April 1961 to June 1963, 6 manned spacecraft were launched. On April 12, 1961, the world's first manned spacecraft, Vostok 1, flew into space, marking the beginning of the era of manned spaceflight. Soviet cosmonaut Yuri Gagarin orbited the Earth for 108 minutes in the spacecraft and returned safely to the ground, becoming the first person to fly into space.

The Vostok spacecraft consists of a sealed cabin (spherical, weighing 2.4t, with an inner diameter of 2.3m) and a service module (composed of a short cylinder and two truncated cones, with a maximum diameter of 2.43m, weighing 2.265t), with a total length of $4.41 \mathrm{~m}$, a maximum diameter of $2.43 \mathrm{~m}$, and a total mass of $4.7 \mathrm{t}$. The cabin has a free space of $1.6 \mathrm{~m}^{3}$ and can only accommodate one cosmonaut. Inside the cabin, there is a life support system for a 10-day flight, as well as various instruments, equipment, and an ejection seat. Before re-entry, the final stage of the rocket and the service module are jettisoned, and the cabin re-enters the atmosphere alone. When the cabin descends to about $7 \mathrm{~km}$ above the ground, the cosmonaut ejects from the cabin and then lands using a parachute.