医学上认为会影响结婚生育的传染病不包括A．乙肝 B．淋病 C．梅毒 D．艾滋病 E．

Every object has weight. But the center of its weight is not always in the middle of the object. If the top of an object is heavier than its bottom, it will fall over easily. We say that its center of gravity is high. But if the bottom is heavier, it won’t fall easily. Then we say that its center of gravity is low.

Look at the first picture. This empty box must fall over, because its center of gravity (C) is not above the line of its bottom (AB).

Now look at the second picture. There is some heavy iron in the bottom of this box. It will not fall, because its center of gravity is above its bottom.

小题1:If the bottom of an object is ______ its top, it will fall over easily.

A．lighter than

B．heavier than

C．no heavier than　　

D．as heavy as小题2:Please point out which box will not fall.

小题3:The main idea of the passage is _________.

A．why things fall over　　　　

B．a low center of gravity

C．a high center of gravity　　

D．that everything has weight

病历摘要：患者男性，38岁，阵发性头晕6个月。无四肢发麻。体检：T36℃，P80次/分，R22次/分，BP178/97mmHg。无满月脸，无向心性肥胖。血：总胆固醇3．8mmol/L，甘油三脂1．1mmol/L，高密度脂蛋白1．2mmol/L，低密度脂蛋白2．0mmol/L。

应先做哪些检查？（）

A.冠脉造影

B.肾上腺B超

C.安体舒通试验

D.血浆ACTH测定

E.24小时尿VMA（香草扁桃酸）测定

F.血Cr

G.血电解质

H.组胺激发试验

I.冰水试验

J.糖耐量试验

1，3-丁二烯与1摩尔Br₂反应时，得到的主要产物是（）。

A．1，2-二溴-1-丁烯

B．1，2-二溴-3-丁烯

C．1，4-二溴-2-丁烯

D．1，2-二溴-1-丁烯

下列关于计算机病毒的叙述中，正确的是______。

A．反病毒软件可以查、杀任何种类的病毒

B．计算机病毒是一种破坏了的程序

C．反病毒软件必须随着新病毒的出现而升级，提高查、杀毒的功能

D．感染过计算机病毒的计算机具有对该病毒的免疫性

有以下程序：
#include＜stdio.h＞
main()
int c:
while((c=getchar())!'\n')
switch(c-'2')
case 0:
case 1:putchar(c+4);
case 2:putchar(c+4); break;
case 3:putchar(c+3);
case 4:putchar(c+3); break;
printf("\n");
从第一列开始输入以下数据(＜CR＞代表一个回车符)：
2743＜CR＞
程序的输出结果是

A) 66877
B) 668966
C) 6677877
D) 6688766