一定观测条件下，对某量进行n次观测，得一组观测值的真误差，则各个观测值的真误差平方的

Here is a menu for fast food restaurant. The prices are in American money, called dollars and cents. There are 100 cents in a dollar.

	small	large		small	large
Main meals			Drinks
Hamburger	1.80	2.30	Coca Cola	0.80	1.00
Chicken burger	1.90	2.40	Tea	0.70	0.90
Vegetable burger	1.80	2.30	Coffee	0.80	1.00
Side dishes			Sweets
Fries	0.90	1.10	Ice cream/ Chocolate	1.20	1.60
Salad	1.00	1.20	Jam	0.50	/

小题1:From the menu, how much does a small hamburger cost?

A．One hundred and eighty dollars.

B．Two dollars and thirty cents.

C．Eighty cents.

D．One dollar and eighty cents.

小题2:If you have only three dollars, what can you buy?

A．A large salad and a large ice cream.

B．A large chicken burger and a small cup of tea.

C．A small vegetable burger and a large chocolate.

D．A large hamburger and a small cup of coffee.

小题3:Jam is a kind of _____.

A．main meals

B．side dishes

C．sweets

D．drink

小题4:Which is not mentioned in the menu?

A．Coffee

B．Fries

C．Hamburger

D．Wine

小题5:A thirsty boy will probably ask for_____.

A．coca cola

B．salad

C．fries

D．a chicken burger