【简答题】生物课外活动小组对某地区一定区域内的部分植物的种群密度进行了连续五年的调查,结果如下表所示(单位:株/m 2 )。 (1)在对植物种群密度进行取样调查时,常采用________法。某同学调查狗尾草种群密度时,随机选择了2m×2m的五个区域同,各个区域内的个体数依次为22,20,24,19,23,则该种群的种群密度为_________株/m 2 。 (2)一个物种的________及迁入和迁出是决定...
【单选题】听力原文:W: Have you been to that new restaurant yet? M: You mean the campus comer? W: Yeah. That's the one. It's right across the street from the entrance to the school. M: No. I've never eaten there. I ...
【判断题】采取限制性抬头的汇票,不经过背书可以直接转让。
【简答题】海水中主要离子的含量如下: 成分 含量/(mg/L) 成分 含量/(mg/L) Cl - 18980 Ca 2+ 400 Na + 10560 HCO 3 - 142 SO 4 2- 2560 Mg 2+ 1272 (1)常温下,海水的pH在7.5~8.6之间,其原因是(用离子方程式表示)______________________________。 (2)电渗析法淡化海水示意图如图所示,其中阴(...
【判断题】采取限制性抬头的汇票,不经过背书可以直接转让。
【判断题】、限制性抬头的汇票不经过背书可以直接转让。( )
【单选题】听力原文:W: That seafood restaurant we went to last night is the best in town! M: Isn't it, though! What does the man think about the restaurant?
A.
It doesn't serve very good fish.
B.
It is an excellent restaurant.
【单选题】听力原文:W:Someone told me the new restaurant on Green Street is pretty good. M:The atmosphere is wonderful.But what's more important to you,good food or nice atmosphere? Q:What does the man imply? (15)
A.
The food at the new restaurant is not very good.
B.
He has not been to the new restaurant yet.
C.
He would like to go to the new restaurant with the woman.
D.
A restaurant's atmosphere is very important to him.