如果将文本框控件设置成只有垂直滚动条，则需要将ScrollBars属性设置为（

下面程序的运行结果是( )。
#include＜stdio.h＞
#include＜string.h＞
main()
char*s1="abDuj"；
char*s2="ABdUG"；
int t；
t=strcmp(s1，s2)；
printf("%d"，t)；

A．正数

B．负数

C．零

D．不确定的值

冬暖式蔬菜大棚已成为我国发展现代化“菜篮子”工程的重要模式。下图是一个温室大棚内的一株番茄的生长发育过程示意图。请据分析回答问题：

(1)在蔬菜生产旺盛时期，透明塑料膜内常有一些水滴，这些水滴主要来自植物的____________。

(2)某菜农为提高番茄的产量，采取了以下几项措施：

①．适当提高二氧化碳浓度；

②．合理密植；

③．夜晚控制的温度应适当降低；

④．适当增加光照时间。其中属于增强光合作用的措施是_____________。

(3)[l]→[2]→[3]完成的生理过程依次是________________。

(4)下图是某生物兴趣小组在探究果实发育过程中的体积变化时，绘制的两朵番茄雌花生长发育期间体积变化的曲线。出现曲线b的原因可能___________造成的。

(5)仔细观察番茄[4]的基部，会发现没有脱落的结构是______________；切开一个番茄会发现果实中有多粒种子，原因是_____________。

(6)在番茄花蕾期，用适宜浓度的2，4-D处理花蕾可提高坐果率，促进增产。为确定施用2，4-D的最适浓度，请完成下列实验方案。

①．将____________相同的番茄平均分成若干组；

②．配制对应组的系列浓度的2，4-D溶液；

③．_____________；

④．统计分析不同组处理组的__________________，确定最适施用浓度。

下列程序的执行结果为
　　Private Sub Command1_Click()
　　　　Dim s1 As String，s2 As String
　　　　S1；="abcdef"
　　　　Call Invert(s1，s2)
　　　　Print s2
　　End Sub
　　Private Sub Invert (ByVal xstr As String，ystr As String)
　　　　Dim tempstr As String
　　　　i=Len(xstr)
　　　　Do While i>=1
　　　　　tempstr=tempstr+Mid(xstr，i，1)
　　　　　i=i-1
　　　　Loop
　　　　ystr=tempstr
　　End Sub

A．fedcba

B．abcdef

C．afbecd

D．defabc

对流干燥流程通常是空气经预热器加热至一定温度后进入干燥器，与进入干燥器的湿物料相接触，空气将热量以对流的方式传给湿物料，湿物料表面水分加热汽化成水蒸气，然后扩散进入空气，最后由干燥器另一端排出。

Generally speaking, a British is widely regarded as a quiet, shy and conservative person who is (1) only among those with whom he is acquainted. When a stranger is at present, he often seems nervous, (2) embarrassed. You have to take a commuter train any morning or evening to (3) the truth of this. Serious-looking businessmen and women sit reading their newspapers or dozing in a corner; hardly anybody talks, since to do so would be considered quite offensive. (4) , there is an unwritten but clearly understood code of behavior which, (5) broken, makes the offender immediately the object of (6) .

It has been known as a fact that a British has a (7) for the discussion of their weather and that, if given a chance, he will talk about it (8) . Some people argue that it is because the British weather seldom (9) forecast and hence becomes a source of interest and (10) to everyone. This may be so. (11) a British cannot have much (12) in the weathermen, who, after promising fine, sunny weather for the following day, are often proved wrong (13) a cloud over the Atlantic brings rainy weather to all districts! The man in the street seems to be as accurate — or as inaccurate — as the weathermen in his (14) .

Foreigners may be surprised at the number of references (15) weather that the British make to each other in the course of a single day. Very often conversational greetings are (16) by comments on the weather. "Nice day, isn’t it" "Beautiful!" may well be heard instead of "Good morning, how are you" (17) the foreigner may consider this exaggerated and comic, it is worthwhile pointing out that it could be used to his advantage. (18) he wants to start a conversation with a British but is (19) to know where to begin, he could do well to mention the state of the weather. It is a safe subject which will (20) an answer from even the most reserved of the British.

20（）

A.stimulate

B.constitute

C.furnish

D.provoke