谈论太空探索与航天成就 — 英语词汇题
题目
根据句意及所给汉语提示，用本单元核心词汇的正确形式补全句子。1. Shenzhou-16 was l________（发射）into space successfully last year. 2. China has sent many s________（卫星）to study the earth. 3. Scientists want to e________（探索）more planets beyond Mars. 4. Walking in space is difficult because there is little g________（重力）there.