P100
2(Possible answers)
(1)F Astronauts can choose from many types of food, such as fruit, nuts，chicken, beef and seafood.
(2)F Sleeping in space is different from sleeping on Earth. Astronauts have to stick their sleeping bags to the wall to avoid floating around and hitting something by mistake during sleep.
(3)F Astronauts are very busy every day.
(4)F Astronauts must wear a spacesuit when they go outside the space station

P102
1 (1)10(2) many (3) harder (4) carefully (5) wall (6) different from
2(1) Because the astronaut was both excited and nervous.
(2) Yes, the astronaut seems to be satisfied with the food in space because he/she can choose from many types of food.
(3) Because everything floats around.
(4) Because it stops the astronaut from floating around the room and hitting something by mistake during sleep.
(5) Because it slows down the muscle loss. /Because it helps them stay fit.
2.(1) hitting (2) gym (3) daily routine(4) mistake (5) cannot afford to

P103
1 (1)e (2)c(3) b (4)d (5) a

P104
2 What space junk is and why it is a big problem for us.
3(1)a,b,c (2) a (3)b,c b

P105
1 (1) crashed (2) created (3) belonged(4) were travelling (5) were tracking (6) were moving

P110
2 (1) It was sent into space on 29 April 2021.
(2) The cargo spacecraft Tianzhou-2 arrived at Tianhe first
(3) They do important experiments and collect scientific data.
(4) Because Tiangong travels at about 28,000 kilometres an hour, it only takes about 90 minutes to go around the Earth. In other words, the space station goes around the Earth 16 times in 24 hours.
3 (1) naked eye(2) supply(3) lab (4) deliver (5) point