a、b、c、d为实数，规定运算.acbd.=ad-bc，那么.241-x5.=1_爱下问搜题

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问题选择题

a、b、c、d为实数，规定运算

.

a	c
b	d

.

=ad-bc，那么

.

2	4
1-x	5

.

=18时，x的值为（　　）

A．1

B．2

C．3

D．4

答案

根据题意得：10-4（1-x）=18，

去括号得：10-4+4x=18，

移项合并得：4x=12，

解得：x=3．

故选C．

单项选择题

Questions 14-23

·Look at the ten statements for this part.
·You will hear a story about "Marriage Customs in Some Parts of the World".
·Decide whether you think each statement is right(R), wrong(W) or not mentioned(NM).
·Mark your answers on the Answer Sheet.

Marriage must always be something of a gamble in people’s eyes.

A．Right

B．Wrong

C．Not Mentioned

多项选择题

乙状结肠扭转属于（）

A.急性肠梗阻

B.动力性肠梗阻

C.血运性肠梗阻

D.完全性肠梗阻

E.低位肠梗阻