在临床医学研究开始之前，必须要把研究方案提交到哪个部门进行审查（） A.科研处 B.

These days when you go on vacation, you spend most of your money just getting there. Travel is expensive, but don't stay home only because you are short of money! Here is some advice:

* Travel during off-season if possible. Flights and hotels are very cheaper when tourism is low.

* Choose a hotel that's a little farther from popular attractions. If you're staying several days,

check out prices on vacation homes — it can end up being cheaper than a hotel.

* Take public traffic, such as buses or subway, instead of taking a taxi.

* Plan your meals, and eat like locals. Don't waste money at expensive hotel restaurants or

fast-food chains. Depending on where you stay, it may be cheaper to make food on your own.

* Check online for special discount （折扣） — if you're a student, the old or the parents

traveling with children, you could get discounts! A little research could save you a lot of money.

Whether you're backpacking alone or going on a family vacation, your trip doesn't have to break the bank. The key is to plan ahead and write down what you spend. Then put the money you save toward your next trip!

小题1:Is travel expensive now?

小题2:How many suggestions are given to save money?

小题3:Which is cheaper, staying at a hotel or a vacation home?

小题4:Who could get discounts?

小题5:What is the passage mainly about?

下列属于索赔求偿的证据的选项是( )。

A．现场设备工程施

B．相关法律规范性文件

C．设备工程合同

D．试车试验报告制时间

有些人从不吃动物肝脏等动物性食物，但很喜欢吃蔬菜，这些人也不一定会患夜盲症。这是因为有些蔬菜中含有（    ）。

A．维生素A

B．维生素B

C．维生素C

D．胡萝卜素

设有如下的关系R和S，且属性A是关系R的主码，属性D是关系S的主码。

若关系R和S的关系代数操作的结果T如下：

则( )。

A．T=π_A,C(

B．

C．T=π_A,C(R×

D．T=π_A,C(σ_C＞5()

煤矿安全监察员是具体负责煤矿安全监察和行政执法工作的( )。

A．国家执法人员

B．国家行政人员

C．国家公务人员

D．国家公仆