Emerging evidence in humans suggests a     1     (typical) Western high-fat, high-sugar junk food diet can quickly weaken your brain's appetite control.

After offering volunteers a week-long binge (大吃大喝) of waffles, milkshakes and similarly rich foods, researchers in Australia found young and healthy ones scored worse on memory tests and experienced a     2     (great) desire to eat junk food, even when they were already full.

The findings suggest something is special in the hippocampus (海马体)-a region of the brain     3     supports memory and helps to regulate appetite. When we are full, the hippocampus is thought to quieten down our memories of delicious food, thereby     4     (reduce) our appetite. When it’s interrupted,     5     control can be seriously damaged. Over the years, extensive research on     6     (mouse) has found the function of the hippocampus is very sensitive to junk food, but recently this has been observed only in young and healthy humans.

In 2017, after a week of Western-style breakfasts of     7     (toast) sandwiches and milkshakes, researchers found participants performed worse on learning and memory tests which are typically dependent     8     the hippocampus.

Now, in this latest study the scientists of the team     9     (find) that not only do such high-fat, high-sugar diets impair memory in humans, but they appear to directly affect our ability     10     (control) our appetite.

Chinese astronauts in Tiangong space station opened a science lecture on December 9th, 2021 as they traveled around     1     Earth.

There     2     （be）a lecture and some interesting activities on that exciting day. First, Zhai Zhigang, Wang Yaping and Ye Guangfu, all members of the Shenzhou XIII mission crew, greeted students, teachers and other participants as the lecture began at 3:40 pm. They then showed viewers the place     3     they live and work. The astronauts carried out experiments     4     （show）interesting physical phenomena（现象）in space,     5     （include） "disappearing buoyancy（浮力）" and a "water ball". At last, before the end of the livestreamed activities, they     6     （happy）answered questions from students.     7     （million）of primary and middle school students across China watched the 60-minute televised event, which was the first lecture of the Tiangong Class, China' s first extraterrestrial（地球大气圈外的）lecture series to make students interested     8     space science.

The manned space agency said that more lectures would     9     （hold）based on the country's manned spaceflights and would also be presented by some     10     （profession）Chinese astronauts. Such activities are intended to spread knowledge about manned spaceflights for science among young people.