
山豆根含有毒性成分,属于哪一类()。
A.苷类
B.毒蛋白类
C.生物碱类
D.矿物类


A.苷类
B.毒蛋白类
C.生物碱类
D.矿物类
Task 3 Complete each sentence with the correct preposition or adverb .
into on up down
1. The bridge wasn't destroyed in the strom. The army blew it ______.
2. I don't want to go ____ all that right now.
3. If we don't get this contract, we may have to sell_____ and move to another town.
4. I can't believe you didn't back me_____ in my argument with Mr. Daniels! I thought you were on my side.
5. Sorry I'm late. I got ______ the wrong bus.
6. The spacecraft touched ______ on the planet Mars yesterday morning.
7. The speed limit is only 50 mph along this road – slow_____a bit.
8. The company is expanding and taking ______ new staff.
9. The police are looking _____ the death of an old man.