航运公司实施ISO 9000系列标准的目的是保证海上安全和保护环境。( )
参考答案:错
一个等腰三角形,它的底23cm,腰32cm,周长是______cm;另一个等腰三角形的顶角是68°,一个底角是______度;如果一个等腰三角形的底角是68°,顶角是______度.
句型转换。
1. I was doing my homework when Li Lei called me. (就画线部分提问)
______ ______ you doing when Li Lei called you?
2. We were watching TV at 9:00 last night. (改为否定句)
We______ ______ watching TV at 9:00 last night.
3. I was talking with my friends when Mr. Wang came in. (用while改为同义句)
Mr. Wang came in______ I was talking with my friends.
4. He gave the police a call just now. (改为同义句)
He ______ the police just now.
5. Do you have supper at 7: 00 every evening? (用last night改写句子)
______ you ______ supper at 7: 00 last night?