Communication satellites generally use solar cells as their source of electric power, although some test satellites have used thermoelectric generators.
A.
superior
B.
authorized
C.
former
D.
experimental
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
皮皮学刷刷变学霸
举一反三
【简答题】Write the number. (写数字) 1. eleven ____ 2. six ____ 3. eight ____ 4. four ____ 5. seen ____ 6. nine ____ 7. nine ____ 8. ten ____
【简答题】用am, is, are填空。 1. How old ________ you? I ________ eleven. 2. What ________ your phone number? It ________ 261 9854. 3. Here ________ the dictionaries. 4. -Tom and I ________ in the same class. -That...