下列各类植物中，不具有输导组织的是〔〕
A．蕨类植物
B．苔藓植物
C．裸子植物
D．被子植物
A、蕨类植物也生活在阴湿的环境中，有了根、茎、叶的分化，并且内有输导组织，能为植株输送大量的营养物质供植物生长利用，因此蕨类植物一般长的比较高大．故A错．
B、苔藓植物生活在阴湿的环境中，没有真正的根，因此无法支持很高的地上部分，虽然有了茎和叶，但茎、叶内无输导组织，不能为植株输送大量的营养物质供其利用，所以苔藓植物比较矮小．故B正确．
C、D、裸子植物和被子植物都用种子繁殖，脱离了水的限制，不要生活在阴湿处，体内都有输导组织，可为植株输送大量的营养物质供植物生长，因此都能长的比较高大．故C、D错．
故选：B
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| English people often go out with an umbrella or a raincoat. Why? 1 the weather in Britain often changes quickly. Spring can be rainy or windy, 2 the weather is getting warmer and you can hope more sunny days. In fact, there 3 as much sunshine in spring as in summer. Summer is 4 time for visitors to go to the seaside. People often go out to have a walk or swim. Autumn is a beautiful season. During autumn it is still nice to be outside, too. In winter, it gets colder, and it might 5 ,especially in the north. There are 6 very heavy winds in this season. February is usually the coldest 7 of the year, while the warmest 8 often July. The difference 9 temperature between winter and summer is not so great in Britain. The average temperature for winter is about 4.5℃, and for 10 is about 15.5℃. | |||
| ( )1. A. Because ( )2. A. so ( )3. A. have ( )4. A. the worst ( )5. A. rain ( )6. A. too ( )7. A. weather ( )8. A. is ( )9. A. in ( )10. A. spring | B. As B. but B. can have B. the best B. wind B. either B. season B. was B. on B. summer | C. For C. or C. can be C. the latest C. hot C. also C. month C. are C. by C. autumn | D. Since D. for D. can D. the earliest D. snow D. as well D. day D. were D. for D. winter |