螺纹磨床丝杠的径向圆跳动误差会造成螺距( )。A．局部误差 B．周期误差 C．渐进

根据下表，选出最佳答案。
Mason’s Clothing Store

Clothes（衣服）	Color（颜色）	Price（价格）
socks	white, blue	$4
pants	black	$11
sweater	red, white	$8
T-shirt	red, green, black	$7
hat	black, red	$6

小题1: —Which is the cheapest（最便宜的）of  all?  —_______

A．Hat.

B．T-shirt.

C．Pants.

D．Socks.

小题2:—How much are two sweaters and a hat?  —_______

A．$14.

B．$20.

C．$21.

D．$22.

小题3:You can buy（买到）_______.

A．black pants

B．a blue sweater

C．a green hat

D．red socks

小题4:You like red and you only have $6. You can take_______.

A．a sweater

B．a hat

C．a T-shirt

D．none（全无）

小题5:You only have sixteen dollars. You can buy_______.

A．a sweater and a pair of pants（裤子）

B．two T-shirts and a pair of socks

C．a sweater and two pairs of socks

D．a sweater and two hats