三国歇后语：

①诸葛亮借箭——____

②孔明弹琴退司马懿——____

③刘备摔孩子——____

如图所示，属于增大摩擦的是(    )

薯片等易碎食品宜采用充气袋包装，下列气体中最适宜充入的是（   ）

阅读短文, 然后用短文括号中所给词的适当形式填空。

      Astronauts used to only have freeze-dried powders and semi-liquid pastes（冻干粉和半液状的糊糊）for meals. Now US scientists want to grow vegetables in mini-greenhouses on the Moon. They look forward to____(provide) astronauts or space travelers with fine dinners of fresh vegetables in the future.

       Paragon, a company that works with NASA, has designed the "Lunar Oasis（月亮绿洲）".

       "Lunar Oasis" is a small greenhouse. It looks like a bell jar put into a 46cm-tall frame. The frame is designed to protect plants while they grow on the Moon.

        They plan to send the small greenhouse into space ____(successful) in 2020. Scientists will put brassica（芸苔）seeds —like acabbage —in the greenhouse. Because this kind of vegetable goes from seed to flower in just 14 days, it can complete ____(it) life cycle in just one night on the Moon.

       The Moon greenhouse has been compared to an experiment at the South Pole. The South Pole greenhouse, now in its____(five) year, allows workers living in the coldest place on Earth to have ____(tomato), lettuces, strawberries and herbs.

       "Living on the Moon seems so far away, but it is ____(importance) that we do this research now," said Jane Poynter, the president of Paragon.