角膜在组织学上分为()A．前弹力层 B．后弹力层 C．基质层 D．上皮细胞层 E．内

具有发散作用的药味是（）

A.咸

B.酸

C.苦

D.辛

E.甘

阅读理解。

House Rules 1.Clean up before leaving. 2.Take showers before 11:00 pm. 3.No staying out after 10:00 pm unless allowed by me. 4.You may have incoming calls on my mobile phone but no out going calls. 5.Bed time is 11:00 pm. 6.Dinner is at 7:00 unless otherwise notified (通知) (if you don't have dinner,you must    let us know before 6:00 pm) 7.Keep noise to the least. 8.No smoking in the bedroom. The Address you are staying at is:112 Kendal Way, Chesterton, Cambridge CB41LF Contact number: My mobile phone number is 08976-25973

1.These rulers are made for ______.

[ ]

A.People who will live with a family B.guides C.people who do the cleaning D.salesmen

2.Which of the following is not mentioned in the rulers?

[ ]

A.The name of the host. B.The time to go to bed. C.Something you can't do. D.The address you will stay at.

3.The person who stays in this family ______ after 11:00 pm.

[ ]

A.can take a shower B.can go back to the house C.should go to bed D.should shout loudly

4.You can do the following except ______.

[ ]

A.Taking showers at 9:00 B.smoking out of the bedroom C.telling the host at 7:00 pm if you don't have dinner D.cleaning up before leaving

5.You are not allowed to ______.

[ ]

A.answer the telephone on the owner's mobile phone B.make telephone calls to others on the owner's mobile phone C.sleep until 11:00 D.know where the bedroom is

在巴黎和会和华盛顿会议上签订的一系列条约中，为美国在中国的扩张提供了方便的是 [ ]

A、《凡尔赛和约》

B、《四国条约》

C、《五国条约》

D、《九国公约》

望天树是我省特产珍稀树种．分别在西双版纳热带雨林中，它们成片生长，组成独立的群落，形成奇特景观．是我国的国家一级保护植物．望天树结实稀少，且不易采种，种子寿命短，研究种子萌发条件尤为重要．某生物小组为了探究望天树种子萌发的外界条件，使用完好的望天树种子做了如下实验，请仔细分析该实验，回答问题：

	水分	温度	光照	结果
1号瓶子	适量	适宜	适宜	萌发
2号瓶子	过多	适宜	适宜	没有萌发
3号瓶子	适量	适宜	无	萌发
4号瓶子	适量	低温	适宜	没有萌发
5号瓶子	无	适宜	适宜	没有萌发

（1）实验中1号瓶与5号瓶形成一组______实验，其变量是______；实验中2号瓶内的种子没有萌发，主要是因为______．

（2）实验中1号瓶和3号瓶的种子都萌发，这说明______．

（3）该小组只探究了种子萌发的外界条件，而种子萌发还要求种子的______是完整的、活的，不在休眠期．

（4）本实验中，每个瓶子中不能只用1粒种子做实验，为什么？______．

油泵噪声大的故障现象及原因？